Back on 2.1 for the Kobolds we had no idea either. There was no creature surrounding them that could be used as a mount, some people suspect could be those syntetise goblins.

In terms of lore it has some kind of creature that of course must fly but is not a dragon. Some creature that are on the forelands, I suspect.

Also could be a creature created by their alchemy skills. The kobolds did the same using their knowledge.