Yes, the 1980 and 1983 Greyhawk setting by Gygax presents the clearly Norwegian "vikings" of Thillonria as brutish stupid "barbarians" who exemplify the despicable Evil Suel empire …
The 2024 Greyhawk walks back some of this. The Thillonrians are still plainly Norwegian …
2024 Greyhawk seems to have taken the sting out of the Anti-Norwegian characterizations, and seems mostly workable from a Norwegian perspective. But the D&D fans of Greyhawk since old school and 3e are still in the process of understanding and integrating this 2024 recharacterization. We will see if the hatespeech against Norwegian heritage ends or not.
Not sure if serious …
As a partially Norwegian American … oh, look at the user name … hey, yo, same name as the King of Norway! … I never saw the Barbarians of the Thillonrian Peninsula as specifically Norwegians. Generic fantasy Vikings, but I never “ooh, the Frost are specifically Danes because they are furthest south” or anything like that.
I agree with others that Greyhawk societies are fantasy societies, not copies of specific real ones - pastiches and blends, in some cases.
As a Greyhawk fan, I thought the lore of the Suloise Imperium was they were led by great magic users. And the earliest lore of Barbarians in the original Unearthed Arcana was Barbarians don’t like mages? The Thillonrians don’t seem to be ruled by mages.
Saying they are exemplars of the Suel Empire is like saying Sri Lanka is an exemplar of British monarchy - sure, they both drink tea and play cricket, both islands, and the history is there, but there are some significant differences.
In my mind, the Scarlet Brotherhood are “Nazi-like”, but the Thillonrians are no.