It may take up to a week before you find him eating.
Here is a list of suggestions I like to provide for those with a newly acquired tree frog. I hope it helps with setting up your new viv and helping your frog settle in.
1. Place the tank in a quiet room and not in direct sunlight
2. Cover three sides of the tank and remove any night lighting.
3. Ensure their environmental needs are met such as temperature and humidity. See the care sheets.
3. Ensure water is either chlorine free (bottled spring) or treated tap water.
4. Limit the times you enter the tank to only when changing water and adding or removing crickets.
5. Monitor humidity and temperature and mist once to twice daily.
6. Provide enough natural accents to allow for hiding, climbing, and perching above the substrate. Since your frog lives in trees, they are rarely found on the substrate and prefer to move from leaf to vine to branch to explore the tank.
7. Slowly remove covered sides over a few weeks to let them become accustomed to their surroundings.
8. Ensure the crickets provided are no longer than the distance between the frogs eyes. Try using the cricket bowl feeding method so you know your frog is eating. May take some time but its all part of settling in.
9. Monitor the frogs activity and weight. If your frog moves around at night in the dark and soaks or sits at the water dish edge, then he/she is doing fine. If a physical visual condition is seen, then its time to worry.
and finally..... relax. Your frog needs to acclimate to the new surrounding and it may take some time.