Knaff

The Knaff is a location mentioned multiple times in the Comic, The Stowaway, and is noted as one of the westerly isles.

Geography
There is no description of this island, but based on the inhabitants' activities, the land is suitable for farming grains and supports grass presumably for sheep (wool). The people of Knaff are known for their fishing, weaving, and brewing.

The Ice Castle
Hroar arrives at Berk as a stowaway and claims to be from the island of Knaff. Later however, Hiccup realizes that this is probably a falsehood after a little research.