I've seen it several times. I don't know if it has any link to authenticity. As a good Norsky Lutheran, I'd be more inclined to believe it was if they found coffee cups, a lefse iron and a bag of stale fish in lye in the same spot.
Norsky Lutheran, lefse...
If you start with the "They used ta call it yam, and now they call it yelly" I'd swear we are related.
(Any kin in North Dakota?)
You bet, and if it weren't for our ancestors poor America would have been deprived of lutefisk.
Not only that but I am one hundred percent Native American, born in Minnesota of Norwegians all. And the Vikings were here before me.