I've always thought it would be awesome if someone kept all the known "bullfrogs" of the world, including:

American Bullfrog [Rana Catesbiana]

African Bullfrog (Pixie frog) [Pyxicephalus adspersus]

Indian Bullfrog [Hoplobatrachus tigerinus]

Asian Bullfrog (Chubby frog) [Kaloula pulchra]

Australian Bullfrog [Limnodynastes dorsalis]

South American Bullfrog [Leptodactylus Pentadactylus]