Does the Bible mention the existence of other gods? Yes, but not noted as the living Almighty Jehovah God. Here's why....

The Biblical story of Exodus acknowledges and affirms the existence of "other gods". It paints the plagues of Egypt not just as war on the pharaoh, but as a war on the gods of Egypt:
“Against all the gods (man-made gods, that is), of Egypt, I will execute judgements” (Ex. 12.12).

God mentioned their "existing", but nowhere in the Bible, does it say God "created" other gods. There is no room for another "god" to exist, as scripture says that God is all-powerful, all-knowing, everywhere present. He is without limits. If another god did exist, then God would be limited. Meaning, if there were multiple deities with supreme power, then the concept of a single, all-powerful God would be undermined, as their power would be shared or restricted by the existence of the other deities, essentially limiting their individual sovereignty and omnipotence.

Most monotheistic religions, like Judaism, Christianity, and Islam, believe in one God, who is the sole creator and ruler of the universe, implying that there cannot be another God with equal power.

Omnipotence

The idea of God being "omnipotent" means having unlimited power, and if another God existed with equal power, it would contradict this concept.

If there were multiple Gods with ultimate authority, then no single God could be considered truly limitless or all-powerful, as their power would be divided.

However, the Bible says God has no limitations.

Men made of themselves, gods and images to worship.

The bible states in any translation, that Yahweh is the only power in the universe and that even when He made Himself known to the holy men of old, they never saw His form or his face. Since mankind is a "seeing is believing" sort of race, they created for themselves "a god" and new gods, because they did not see Yahweh. [Deuteronomy 11:16-17, Deuteronomy 27:15 Deuteronomy 28:14 Judges 2:11, Ruth 1:15, I Samuel 7:3], the list goes on and on. In doing this, they gave themselves up to the curses talked about by Moses. They came to worship the creations, rather than the Creator. I Chronicles 5, talks about how the tribe of Reuben was given up into captivity for worshipping man-made gods andimages, I Chronicles 5:25. This is no different than worshipping the Jewish star, the cross, the golden calf, or a picture of Jesus or the Virgin Mary. These are all images some worship, rather than the true Maker of the universe and all things in it...Yahweh.

The Bible speaks only of false, man-made gods, called idols, that exist, but they have no real substance or reality. They are not "alive". As seen above, they were made from the imagination of those people who worshipped them. Man made them, then copied their doctrines from YHWH.

When Moses was on the mountain from which he spoke with God and received the Ten Commandments, after receiving them, the Book of Exodus 32 reveals a corrupted people, so God told him, "Get thee down to thy people, because they are sinning by making golden idols and worshiping them as their god!", and God rebuked them.

Only one God actually exists. Further, none of the other man-made false gods, died then resurrected from the dead. If another god had existed, then God would not be the self-existent, all-powerful God, He is. Two all-powerful, all-knowing, everywhere present beings, could not occupy the same space.

Though the Bible makes REFERENCE to false gods, it does not state that these are actual living, breathing, seeing, hearing, gods who exist. The Apostle Paul wrote:

But, then indeed, when you did not know God, you served those, which by nature, are NOT GODS (Galatians 4:8).

They Cannot Compare To The Biblical God

Scripture shows that these false gods are not to be compared with the One, true God:

To whom will you liken me, and make me equal and compare me, that we should be alike? They lavish gold out of the bag, and weigh silver in the balance; they hire a goldsmith, and he makes it a god; they prostrate themselves, yes, they worship. They bear it on the shoulder, they carry it and set it in its place, and it stands; from its place it shall not move. Though one cries out to it, yet it cannot answer nor save him out of trouble (Isaiah 46:5-7).

No Other gods Exist

The Bible is clear that although there have been made by man, other so-called "gods", there is only One eternal God who exists. Isaiah wrote:

You are my witnesses, says the Lord, and my servants whom I have chosen, that you may KNOW and believe me, and understand that I am He, and before Me, there was NO GOD FORMED, nor shall there be, after Me. (Isaiah 43:10)

They Are Inventions In The Minds Of Humans

These so-called gods were inventions in the mind of people who rejected the Truth/Truths of the one true God. Only the God of the Bible has real substance. The psalmist wrote:

Our God is in the heavens; He does whatever He pleases. Their idols are nothing but silver and gold, made from the work of human hands. They have hand-made mouths, but do not speak; eyes, but do not see. They have ears, but do not hear; noses, but do not smell. They have hands, but do not feel; feet, but do not walk; they make no sound in their throats. Those who make them, are like them; so are all who trust in them (Psalm 115:3-8)

This is why Almighty God said not to worship man-made gods. They cannot help us nor save us from the condemnation that sin placed on us. Only Jesus is worthy enough to do that, and was called by His Father to be Savior of the world.