You might be interested in some posts by Daniel L. He owns several of the hybrid subspecies called P. Mozambicus. Last year I got one myself from a website claiming it was an adspersus and Daniel helped me identify it. I posted some pics of her here: http://www.frogforum.net/african-bul...-p-edulis.html

Here are some links to Daniel L's frogs:
http://www.frogforum.net/african-bul...-p-edulis.html
http://www.frogforum.net/african-bul...us-edulis.html

There seems to be a lot of confusion around the African bullfrogs in general. Between mislabeling in pet stores and websites, wild captures being imported from many different regions, and the many uncategorized subspecies of Pyxicephalus, it's hard to tell sometimes what you actually have.