A Jotun is a giant, member of the Jötnar race, of norse mythology. By default, in their original mythology, a jotunn is one of a race of giants associated with the fire element, inhabiting Muspelheim, a place of heat and fire, represented in Random Kingdom most likely through the Red Giants; however, from my understanding, the term also encompasses a group of ice-affiliated giants called the Hrimthurs, represented in Random Kingdom through the Blue Giants.