and I'm wondering if there are any areas on the Blackmoor map with that sort of feel to it. I know very little about the setting beyond the areas directly surrounding the city.

...and now I realize this was a somewhat stupid question, it looks like one of the more persistent threats of the setting are what amounts to Viking raiders from the north. Is there any details at all about that region of the map? It seems its off the Blackmoor map to the north.

Right, it's off to the northeast, but nothing has really been published about it that I am aware of. The Great Svenny is reputed to be decended from 'Skandaharians' that raided the Blackmoor area and decided to stay and settle rather than return to the north.

Having done a bit more reading on the subject (and gotten a better idea of how what I'm wanting to do would fit in Blackmoor), it looks like the most likely site for a Skandaharian presence on the map would be Bartertown, unless I just want to invent something whole cloth (which I'm not against doing, I'm just trying to see if what I want to do would fit in something that already exists before I invent something)

Near as I can tell there isn't much mentioned about Bartertown outside the paragraph or so in DA1. Is there anything in that region of the map that has been detailed at all? North of the Black Sea between Bartertown and the Firefrost Channel?

I usually recommend the comic book "Northlanders" for people who want to get a feel on how to tell sensational stories in a low fantasy setting.

If you're into comic books, it might be worth a look.