Swamp Men are a species of amphibious creatures that live outside the walls of Trolberg.
Only one individual of this species appeared in both the animated series and tie-in series being Sigurd.
They have a humanoid appearance, but with a green skin. According to "Hilda's Book of Beasts and Spirits" their bodies are made up of mud and vegetation.
It is unknown how old they can get, but it is estimated to be at least several centuries.