Bienvenido a "Frog Forum" Ian! Many of the questions you asked are answered in the African Bullfrog Care Article John wrote: Frog Forum - African Bullfrog - Pyxicephalus adspersus - Care and Breeding .

I'm no ID expert; but agree your attractive frog does not look like a P. adspersus. There are many threads on ID subject here that discuss ID challenges (i.e. 7 in. male Dwarf African Bullfrog). Read here the genus was reviewed recently; but have not found the scientific publication that lists species and how to ID them.