Lost at Sea
At an undisclosed time, Hedgelout set out to sea presumably on a ship and never returned.
According to Spitelout Jorgenson, Hedgelout was the second choice to carry the Jorgenson Ceremonial Axe, meaning he is most likely an influential member of their house. Except of course, for the fact that "he's still missing at sea . . ."
Hedgelout is mentioned once but not seen in the episode "Snotlout Gets the Axe".