Thump

Thump is a female Raincutter who had her left wing sliced by razor-nets made by Drago Bludvist and his trappers. She was then rescued by Valka and Cloudjumper, who cared for her in Dragon Mountain, along with Gruff and Lump. Thump is forever grateful with Valka, often bringing her slimy worm and grub snacks as gifts.

Trivia

 * According to leaked pictures from "Rise of Berk", Thump used to be named 'Rainclaw'. However, it is possible Rainclaw is just a another Raincutter.
 * Thump is the only known female dragon with a disability.