I feed my green tree frog (along with a few other local species) about once or twice a week. It's a female and I've seen her eat 10 small to medium-sized crickets in one feeding. Then she sits fat and happy on a brom leaf for 3 or 4 days. She sometimes feeds when the lights are on, but I've dumped in two dozen crickets and watched half of them disappear into the substrate almost immediately. I have a very small snapping turtle in the pond who grabs any that end up in the water.

If your enclosure is pretty tight, the frogs will eventually get most of the crickets that are hiding.