Kyndling is a Hairy Hooligan that is mentioned briefly in the Comic, "The Endless Night".
A stranger named Skuld the Sorceress appears on Berk during the events of "The Endless Night" and mysteriously seems to bring about Night during the Day and the vanishing of villagers. Kyndling is one of the "disappeared" that Hiccup talleys. Later however, the Dragon Riders discover that those who disappeared were actually kidnapped to be sold as slaves by the Thunderhead Tribe, who are working with Skuld the Sorceress.
There is no image of what Kyndling looks like, or any description.