I agree with Poison.

Not a very difficult frog to care for but do eat quite a bit and can grow quite large.

here is a care sheet for leopard frogs but the same rules apply for american bull frogs.
hopefully that is what you are referring to, and not a african bull frog.
They are quite different and require different care.
but about the same in difficulty of care. and and even a dwarf pixie can be quite large and eat a bunch.