Good info, although I'm more inclined to believe it's from Vikings settling along the coastline.
The first known PERMANENT Scandinavian settlement was what is now called Delaware. We know that oly a handful of the people there were Swedes. The rest were the sort who live in tents in the winter!
Early records name some such places. "Brick Rowe" is mentioned in early Jamestown records, for example, but this could be a site in New Jersey or North Carolina for all anyone knows. Then there are the mysterious Wallonian settlers who built the Wall from which Wall Street gets its name. Although it's claimed that the wall was built under the Dutch, it seems to have been there before Manhattan was first sold. So, who were those people and why were they there? No European source informs us.