All right, we know that Chomper is separated from his parents in the TV series, possibly by Red Claw. My question is, how?
The Mysterious Island is a long way from the shore, and the only Land bridge is destroyed. Chomper also somehow knows Red Claw beforecoming into the Great Valley (watch the Star Day Celebration episode). Also, Chomper never mentions his family, while Ruby does.
Here's my theory:
A powerful Earthshake hit the Mysterious island, sending it hurtling towards the shoreline. Chomper somehow survived but his parents were killed. Red Claw was on the island and did not die (if the other sharptooth from LBT V could live on the island unknown to Chomper, why couldn't others?).
Red Claw chases Chomper. Chomper outruns Red Claw, and meets Ruby and her family and is adopted by them. Then, as seen in The Star day celebration, Red Claw, Screech and Thud strike and Chomper and Ruby end up in the valley.
BtW, I think Chomper's parents will never be shown in the movies. I think the creators just want to forget about them.
Also, I think they threw away the animations for a traditional green Sharptooth. Look at the recent episodes and none of them are seen (like the one in the first movie). Take a look at the 'lone Dinosaur returns' episode.
In his tale, the green sharptooth is replaced by another brown one. And in 'the Great Longneck scheme', Rhett claims he fought light-brown (Red-Claw coloured) sharpteeth. So waht happened to the green ones?
And therefore, I don't think Chomper's parents will be featured as they're both green sharpteeth.