What do I do with these wild frogs?

I'm surprised about what the education director said. I've seen animal experts release animals where there are healthy breeding populations not necessarily back to the area they are from (I'm really skeptical about the bacteria thing, no animal can be that sensitive to microscopic changes like that) . When I read this the option I was most considering in my head was giving them back to the girl but since you don't trust her well there's not much you could do. Well if you released them into the pond nearby it would go against what your education director said but you're in a desperate situation then I'd do it and release them there. I mean they're other green frogs for it to breed and compete with, the ducks may act as predators but that's ok not every animal is supposed to survive, you know predators are nature's population control. You should just let nature take it's course after that. But if you really want to take your directors advice into play then give them to someone you know that you can trust that lives in the area near the girl so they can return them there.