I kept the heat and the humidty up by using dried moss as the substrate, and I placed an undertank heater along the BACK of the tank where it couldnt burn the frog. In a plastic tub, a heating pad placed under the tube, with the tub raised up on feet so it won't melt the plastic.
A cold Frog won't eat. A warm one won't want to stop. Pac-man's like large crickets, roaches, nightcrawlers, small fish etc.