What kind of frog i can get?

I want the biggest frog i can get without feeding it live animals like mice and stuff... it makes me sad :( oh and thats pretty cheap. Someone told me i can get an african bull frog and just give it crickets and stuff but i dont know if that is true. Help me out? I like them to be super big. I like things that are way bigger than they need to be. Thats why i chose base over cello lolllll