I would get the temps down into the 70s to start. I would also add a larger Tupperware container to one side of the tank and fill it with dechlorinated tap water to a level about chin deep so they can soak in it.
Add in some clean Pothos (plant) cuttings to give then something to go under to hide from the light and feel secure too.
What levels of humidity is the tank maintaining? It should be at a minimum if 50 to 60 percent. 70 percent would be better if you can get there.
You also need to get calcium for them. Dusting fruit flies is easy. Put a small amount of the calcuim in a large plastic cup, sprinkle the flies into the cup and shake lightly. i spoon them out of the cup and drop them into the tank near the feeding stations. I have banana in the tank to attract the flies to for a feeding station. Just place the piece of banana in a large plastic bottle cap or similar.
The banana can rot away and keep attracting the flies for a good amount of time.
Are your frogs active at all?
Seem to have energy to chase down food?