hi! maybe those are references to Sami shamans? Hopefully some of the Norse historians can help out here, but in any case, you may be interested in these previous threads on Norse-Sami relations: there are a few mentions of shamans here & there

• What was the relationship between the Sami and the Vikings like?

• What was the relationship bettween the vikings and the samii people?

• What was the relationship between the Sami people and the so called "Vikings"?

• Did the Sami (also known as Laplanders) ever war with the Vikings, if so why?

• Is there any historical evidence of the Vikings coming into contact with the Sami people? Were there any peaceful or violent engagements?

• What is the relationship between the pre-Christian Norse religion and the religion/shamanic practices of the Sami people?

and here's some other posts on Sami people if you're interested

• Sami pre christian religion

• How different were nomad societies from each other? How many common elements would one find among the Mongols, the Tuareg, the Comanche, the Maasai, the Sami, the Scythians, etc.?