Vedrfolnir

Vedrfolnir (also spelled Veðrfölnir, Vedfolnir or Vethrfolnir) is an eagle who lives at the top of the world tree, Yggdrasil. He flaps his wings to create windstorms causing the branches to rip and devastation throughout the Nine Worlds. Ratatosk constantly delivers insults to him to try and destroy the tree.

The Sword of Summer
Although he does not appear or is even mentioned by name, Blitzen mentions, Vedrfolnir to Magnus Chase after they were chased out of Yggdrasil by Ratatosk.