Ice dragons

"Bloody ice dragon! Gods be good, now that I would love to see."

- Gared Tuttle

An ice dragon is a legendary species of dragon.

"The Lost Lords"
If Gared Tuttle chooses to tell Jon Snow that he intends to find the North Grove, Jon will laugh and say that Old Nan used to tell him and his half-siblings a tale about it that featured ice dragons and trees as tall as the sky.

"The Sword in the Darkness"
Duncan Tuttle delivers some ironwood to Castle Black and gives his nephew Gared a map that belonged to Lord Gregor Forrester that seems to show how to find the North Grove. Gregor has written on the map that the North Grove is located "beneath the watchful eye of the Ice Dragon".

In the books
In the A Song of Ice and Fire novels, ice dragons are said to roam the Shivering Sea and the White Waste. They are said to be larger than the dragons of Valyria and made out of living ice, with pale blue crystal eyes, vast translucent wings and very cold breath. There is a constellation of stars to the north called the ice dragon, with blue eyes that point north.

As he does in "The Lost Lords", Jon Snow recalls Old Nan telling stories of ice dragons when he was a child.

George R.R. Martin published a children's novel in 1980 titled The Ice Dragon. The world that it is set in contains several similarities to the world of A Song of Ice and Fire', but it also contains several differences. Some publishers suggest that it is set in the same world, though this has been a topic of some debate.