"regions of Aventuria that are the home to orcs emboldened by their whale-god Swafnir"
You are mixing two different things.
The orcs have nothing to do with Swafnir. The orcs have Tairach and Brazoragh and their Orclands. Swafnis belongs to the viking-similar-region of called Thorwal.
Aventura is a cool setting to play with a very detailed history.