It's a giant. What was the name of the place you picked it up from, and what were their living conditions like? Looks more like a male to me, maybe get a few other opinions from other people. Have you read over the care sheet on them yet? Frog Forum - African Bullfrog - Pyxicephalus adspersus - Care and Breeding. It will help you get a better understanding of how to properly care for it, you said you've had other frogs so you probably have enough of an understanding, but it's still good to check out.