Penguin (Franchise)

Penguins are thus far only mentioned once in the How to Train Your Dragon Franchise, in the game, School of Dragons.

Description
Penguins are flightless birds belonging to the Family Spheniscidae. They are widely known for their upright position, shuffling gait on land, and their predominantly black and white coloring. Penguins are highly suited for life in the water. Their "wings" are not suitable for flight as other birds, but are instead adapted well for fast swimming in the ocean.

Penguins actually only occur in the Southern Hemisphere, with the Galapagos Islands being the Northern most location they are found. Penguins are not exclusively an arctic group either - a large portion of species occur in temperate regions.

Function
In the Franchise, Penguins have no function, and in reality, historical Vikings would not have come across penguins at all, due to their distribution on the other side of the equator.

In reality, penguins have been consumed by humans, but not on a large scale. They are often part of zoos and other public displays.

School of Dragons
There is a Stable Quest called "Lynxes, Penguins, Oh My!" in which the player sends non-active dragons to help Fishlegs catalogue the fauna of islands nearby.