New FBT owner need help ?

[Angela P]

It really just looks like shed skin to me. My White's Tree Frogs get shed skin on the side of their tank all the time. They like to soak in the water when their shedding as well. I don't see anything abnormal with your frog. The green may be part of his pattern.

[Tongue Flicker]

You can put more plants or pebbles at the sides/corners to facilitate a sense of security. Your tank looks quite bare/open so your frog just thinks that there's no glass preventing he's wandering activities