He does. In the 5th movie he was talking sharptooth to his parents. And likely he was at the end of the 2nd movie when he meets his parents, though that was not subtitled so maybe he was doing just baby babbling in sharptooth. He has also been shown to be speaking sharptooth to other sharpteeth. 1 was in the episode Escape From The Mysterious Beyond when he talked to Thud, I think it was, that was subtitled. He also talked sharptooth to the fastbiter mother in The Great Egg Adventure, though that was not subtitled.