frogs will eat anything that moves and can fit into their mouths.
frogs that are more aquatic will eat fish as well as the usual insects,
the more terrestial frogs don eat fish in the wild but they will take it if u feed them.
just give them a variety of foods rather than an single type and also try to dust the food with some supplements at least once a week and u'l have yourself a healthy pet that can live for several years.
