Ventilation. Treefrogs need it! The lack of ventilation could be the cause of the green spots, possibly. Green spots are just an indication of an irratation, not the disease itself. There are several things that can do this, some are fatal, some are not. Only your vet can say for sure. Like I said, try the Lamisil bath, that should eliminate any fungal threat. If it persists look at your husbandry, make sure its correct and if it is, take the frog to the vet.