Wiping themselves with their hind feet happens when shedding or cleaning off dirt and debris, so is some rubbing with the forelimbs. Shedding is usually pretty obvious- they will inflate with air to stretch out and loosen the skin then repeatedly 'yawn' as they swallow the shed. I've never noticed any secretions coming from their skin.

Does your frog have a water dish he can soak in if he feels the need?

Quote Originally Posted by Tubby0512 View Post
Also my tree frog will tuck his hands under his throat and hold his hands together is that normal?
Yes, that's a normal water conserving posture. They'll sit with as much stuff tucked in as possible to minimize the surface area exposed to the air to minimize water loss. This also helps them blend in with whatever they're sitting on.