Hi Amy,
It is very hard to diagnose an illness and cause without a ton of historical information.
So many things come into making a decision on how someone should proceed and good detailed photos of both the frog and enclosure always help. Here is a link http://www.frogforum.net/tree-frogs/...enclosure.html that some members put together to help determine what is going on and make a better decision as to what you should do. Please note that when your concerned about your forgs health it is always best to see the local vet since hands on is always better than any photo or description. If you "Copy and Paste" the questions from the linked thread to here, then answer the questions it may help others give a better answer to help.

I would believe just a fecal exam should run around 20 bucks if the vet is not seeing the frog and its just a fecal exam.