I think there is a passage somewhere that referees to all animals talking with there own tongs. In 'The Hobbit' Tolkien tells us that Gandalf could understand the language of the Wargs. He did not like what he heard, but that cannot be helped. The Goblins also could understand their tongs, and of course Beorn knew many languages of animals.
So, from that, I'd say yes. Animals could talk with there own languages. Although, I could be wrong...
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