Mine must be different because they eat in their aquarium, I would not remove them to eat in a different container, in the wild they would not go somewhere else to eat unless there is a threat or some other reason. If you keep trying I hope they would eat where they are. I won't give mine roaches, gee the shell would be hard to digest since it takes driving a truck over them (roaches) to kill them, I even wonder how mine digest crickets! I even think worms are the easiest for frogs to eat. I'd like to offer mine guppies but am leary of getting a sick fish, frogs would probably love it though.