What are some popular children's television shows?

I do not have a television or children, so I have lost touch with what they watch. The last shows I recall are Barney the dinosaur and the Arthur cartoon. When I was a kid, there were a whole slew of shows. I am sure other seniors on the site will recall such shows as Romper Room, Howdy Doody, Wonderama and Rocky and Bullwinkle, just to name a few off the top of my head. I think TV watching has changed so much with streaming that it is hard to identify what shows are popular. My granddaughter gets to watch a half hour of television at a set time each day so they turn on a streaming service and she chooses from any number of short offerings.
They change every few years, but Dora is popular and Peppa Pig are also popular with kids. There are probably newer ones that are popular. Google “Nickelodeon shows” for the most recent.