Starfish

"It's a starfish, or otherwise known as sea star! It's a creature that lives in the sea."

- Tuffnut about the starfish

Starfish is a marine animal that has a minor appearance in How to Train Your Dragon (Franchise).

Description
Starfish is an invertebrate of the class Asteroidea. They can live from the surface of the water during tides to 6,000 meters (20,000 feet). Most starfish have 5 arms but there are others that can have up to 40 arms.

The starfish seen in School of Dragons is a Common starfish (Asterias rubens). The common starfish has five medium-sized arms. They are usually orange with small white spines.

Function
While there is no function for the starfish in the franchise, in the real life they can be kept as ornaments or even be eaten if prepared correctly.

School of Dragons
The starfish appears briefly in this game during the quest Gross Cool Things. In this quest, Ruffnut and Tuffnut talk about some marine wild life, including the starfish.

Dragons: Rise of Berk
The starfish is an item that can be found while searching with Toothless and can be used for completing collections.