[boreas]

Possible, but it seems simpler that they included luxury items from the Islamic world in their burial practices without understanding or worrying about the religious connotations of the script on them.

Ibn Fadlan observed the "viking" Rus in southern Russia. It would be more surprising if there was a significant community of Muslim converts in the Scandinavian homeland.

Fascinating stuff.

Edit: and another guy posted a link that makes a great argument that this was fake news in the first place