Some Jotunn and Giants work with the Summer or the Winter Court or act alone.    From Wordnik.com.  [EN World D&D / RPG News] Reference

This would include Dwarves (Earth benders), Jotunn (masters of various elements), Gnomes.    From Wordnik.com.  [EN World D&D / RPG News] Reference

A Jötunn (Jotunn or Jotun) is a giant in Norse mythology, a member of a race of nature spirits with superhuman strength, separated into categories such as frost giants, fire giants, sea giants and storm giants.    From Wordnik.com.  [Comic Book Movie] Reference