After I have been waiting since January 21st for an answer I don't think you have the right to get saucy after waiting just 24 hours. The reason why I haven't yet answered is that I want to get some screenshots which prove that your claim of that sharptooth looking like Chomper's parents is rubbish (you already gave quite a bunch of differences yourself).
You also misquoted Chomper "not my mommy's roar,not my daddy's roar" would in my opinion not give any substance to your claims that this sharptooth is supposed to be Chomper's uncle. However, what Chomper really says is: "I wonder who that is. Not my daddy!" One would expect him to know his uncle if he hears him, don't you think? And there is no whatsoever indication that he recognized the roar. He hears Littlefoot's shouting which makes him come to the rescue. You can interpret anything you want to into the sharpteeth's roar but that doesn't give any substance to your claim either. Believe what you want, but to me your claim sounds so non-sensical that even answering seems like a waste of time.
