Good question. Littlefoot's grandparents are called longnecks and they couldn't get into a wreck with a car if they could not fit in the car. So it would have to be a baby longneck, as Littlefoot is called by Ichy. But "longneck" seems to be mainly used for adults, so it would not be a longneck but a child. The child is a young longneck but not simply "longneck" as was mentioned. The young ones can be called a "longneck" at times I suppose, so that would be a temporary title just to get into the car in context to the question. As he steps in, a friend could say, "See ya longneck. Don't have a wreck." But with no hands, he crashes. So that takes care of one getting into a car and wrecking, but since it would seem odd to say a "longneck" wrecked because that is the reference for big ones. So a character being temporarily called longneck by those his age, could fit in a car since fitting in one sounds more realistic if it was a convertable with the roof down. But no matter what you say, a longneck crashing doesn't fit, so we can just say the longneck is no longer one with his friends gone to call him that, and therefore is called a kid again and a kid crashing a car does make sense. So my answer is no.
Why does Littlefoot desparately want to be trusted in VII by the grownups and IX by his friends then turns around and lies to everyone in XI?