Whites tree frog has turned brown

[DonLisk]

Your frog should be pretty still all day since his main activity is at night when the lights are out.
After he settle s in you can add a night light but its best to let him get comfortable first.

If you look through some of the members photo albums you will see how the same frogs can look totally different in color.

To ensure he/she is eating, try using a glass bowl sunk into the substrate and put the crickets in that. Also, if your finding droppings then he/she is eating. They just need some time to dettle in and sometimes this can take a few weeks. Best thing is to not hover over him, not many changes unless needed for keeping the correct humidity and temps, and relax so he can too. :-)