Frogs will eat flies, worms, crickets, moths, and other insects. Or, if there is another frog nearby that is small enough to swallow, that frog will be eaten. Snakes, birds, bigger frogs, mongooses,...
Normally they eat living creatures like insects, and other smaller animals. They like to eat spiders also.
It depends on the frog and or toad. usually not but they might
I had a frog and he didntTry feeding him grass or lettuce
they can but they just prefer to eat live ones. more fun, i guess :).