First, welcome to EVC! Here all hypotheses will be scrutinized by some very well-educated and skeptical reviewers. If it passes their review, you may be onto something.
Unfortunately, I bear additional bad news.
You lost me here early on:
The Scandinavian race evolved from the Black African race that migrated out of Africa some 125,000 years ago and settled in Scandinavia. 80,000 years of total isolation in Scandinavia and the original Black Africans evolved to the original Scandinavians.
Jump to the middle of this Wiki article to see what some parts of the Earth were under during the time period you propose, aka the last glacial period, to see the extent of glaciation in Scandinavia
People throughout history are noticeably absent from populating the interior of miles thick ice sheets for a simple reason -- there ain't a damn thing to eat.
RAZD showed how genetics and archeology, not speculation on race, informs us of past migrations while caffeine shows the very concept of race is obsolete.
And now geology.
I think your hypothesis may need some modification as last I understand, Jon is studying linguistics and may chime in as well.
Read not to contradict and confute, not to believe and take for granted, not to find talk and discourse, but to weigh and consider. - Francis Bacon