Hmm. Interesting thought, but we really can’t know for sure. The normans were also from Norway originally but they were masters at adapting their culture to the local culture, which is part of why they reigned so long. So my guess is that the Norwegians would also would’ve adapted similarly over a long period of time. Vikings had several holds in Scotland for example and their merging with the Picts and other ethnic groups kinda created the current Scottish culture, which is mostly similar to the original with a little bit of the Norwegian culture in small things. The language would be the biggest difference. English is derivative from old English before the invasion, but it was then highly influenced by the French of the Norman upper class. Instead my guess is English would no longer be a part of the Latin language with mixed Germanic languages, but a purely Germanic and Scandinavian type language.