It deff. sounds like the Tree Frog is male. The PCF usually doesn't like a different species around them so i would deff. separate them. I have 3 PCF's: 2 little female ones that are growing and a male that is an adult and they LOVE to be around each other! I just got home from work and looked in the tank all 3 of them burrowed into the moss an inch away from each other. They are fun to have and are very entertaining when they are awake and hopping all around there terrarium.