They are nocturnal, during the day they do just sit. 3 of mine like to sit right out in the open and not move. Only 1 likes to hide, and that one is a stressed out spazoid, I'm going to be putting it in its own tank in a quiet room to see if it helps.

They are most active at night. Also, if you don't have thick stable branches that your frog is comfortable hopping around on, it isnt going to try to get on them. What is your temp/humidity like? Is it eating?