Found

As a baby hiccup was taken away from Berk for 20 years. No one apart from Stoick and Valka know he's missing or possibly dead or so they think. But when Astrid goes for a walk into the woods after a frustrating day maybe just maybe there is a glimmer of hope.
But Berk has been receiving mutable attacks from the outcast, who are trying to find Stoick's weakness and take over Berk. When Alvin the leader of the outcast discovers Astrid's little secret maybe they have found something worth everything to Stoick and that may get them their victory.

I do not own any of these characters or settings, everything belongs to dreamworks animation.