A crisp is extremely similar to a crumble in that it is a baked dessert made with fresh fruit and a crumbly streusel-esque topping. Originally, the difference between a crumble and a crisp, however, was an ingredient used in the topping: crisps would contain oats and crumbles would not. In an actual crisp, as in apple crisp or strawberry crisp, the oats in the topping crisp up as it bakes, hence the name.
