Night Fury

Technically only Toothless is the Night Fury in the game, You cannot buy others. The Night Furies (Toothless) specialty is Logs and Fish. You can send Toothless the Night Fury into expeditions to find other dragons and other like runes, wood and fish, Night Furies (Toothless) is obtained at the start of the game and is the only Night Fury you can get.