I had a pair of Albino African clawed frogs.
They would wait until the feeder fish grew big and fat before devouring them.
One day, I came home to discover the female clawed frog with the male clawed frog in her mouth. She had swallowed all but the legs. I tugged on the legs and pulled out the partially digested frog.
There was plenty of feeders in the tank so this cannibalistic act was not due to hunger. There was actually about four very large feeder goldfish and some minnows in the tank before I left my house that day. When I came back everything was gone. I ended up giving the cannibalistic frog to my sister who kept it in her preschool classroom.
The frog eventually met her fate and died from overeating. My sister went on vacation and while she was gone the feeders grew large. Then the frog ate them. She stuffed herself to death.
Moral of the story; watch the intake because these frogs have no limits. Good luck.