African (Pixie frogs) Bullfrogs are very aggressive and often show territorial aggression. They inflate their body and attack the intruder with its huge mouth agape. Also, the frogs are solitary by nature (except during breeding season) show a cannibalistic nature, and consume their own species. Hence, it is not a good idea to keep two African Bullfrogs together in the same tank, otherwise, they’ll fight and the winner will consume the loser.