The Blue Whale

The Blue Whale is Stoick the Vast's ship, first seen in How to Speak Dragonese of the How to Train Your Dragon Book series.

History
The Blue Whale first appears at the end of Book 3. Stoick believed Hiccup that the Romans were stirring trouble in the Inner Isles and set out with a fleet of Hooligan ships to Fort Sinister. Before he got there however, a Roman Observation Balloon containing his son and friends crash-lands on deck of The Blue Whale.

Physical Appearance
There is no description given of The Blue Whale. Presumably it has the appearance of a typical Viking longship and is large, like a Whale. It does have more than one sail, however, indicated when the Roman Balloon becomes tangled in the "sails".