How to Train Your Dragon Dances with Ice and Snow

There lives a young dragon trainer named Hiccup on Berk Island. He and his partners guard the safety and peace of Berk Island. One day, Hiccup decided to travel with Toothless for some reasons. After explaining everything to the other people on Berk Island, Hiccup set out with Toothless on an unknown journey. The two of them traveled an unknown distance on the sea until they encountered a piece of land. There were snowstorms blowing all the time on this land. What kind of things would Hiccup and Toothless encounter here?