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Hmm... it (she?) is American and has a ridge going from the nose all the way down the back, and those stripey patterns on the legs. Looks pretty decent sized too. Could it be a green frog?...

Have you found any solution yet? Mine started foaming a little too; we have the same water filter and there was some foam coming up around the plants in front of the "waterfall" area until I removed...

Sorry about the late reply! Earlier I didn't even notice the flag of Argentina in your avatar, so when you said "common frog" I pictured something very different than the one in the photo. lol. He...

So sorry to hear about the poor frog! Thanks for trying to help him. I'm no expert and can only repeat what I learned from reading forums like these (hopefully someone more experienced can reply...