Oh, some dude accidentally bred too many and couldn't look after them. He told me they were normal hyla arborea.
Also, if you're right, (which it looks like you are) this isn't good because the tank it set up for a temperate climate frog, not a tropical one. and I did my research on how to care for a common tree frog, not an exotic one. One was already looking a bit worse for wear when i got it. Anyone got any ideas on what i should do?