Reptile & Amphibian Forums

Hello,
I have 4 Pacific Tree Frogs (yes, I have a fishing license)that are about 18 months old, they have been doing great, but about 2 weeks ago, I noticed one of them had a white bubble near his mouth, so I took him into a local store here, and they said it's on the roof of his mouth because they were able to open his mouth and see his tongue. They had no idea what it could be. I separated him from the other frogs and he is still alive. He tried a couple times to get crickets, but he doesn't get them because of his mouth. He just gives up, and hides.
I looked at my other frogs today and now another one has a small whit bubble on his mouth! The other frogs bubble is remaining the same size that it was and has pink sploches, almost like veins on it. The pet store verified it wasn't his stomach.
Does anyone know what this could be? I am so worried about them and I cannot afford a vet!
I have cleaned out their terrarium just so you know.
Thank you!

Hi I added a picture of one of the frogs, it's not the best, but maybe it will help determine what's wrong.
Thank you again!