Old Airman
Banned
Theoretically, it is possible (Western Slavs lived next door to Danes in pretty much the same climate, so they can live in Scandinavia without a lot of adaptation), but unlikely. Scandinavia had as much population as it could support from before Slavs came around. So, some charismatic Western Slavic knyaz can unite Polabians and others and lead them North circa 800-900, wiping out Norse men and impregnating enslaved Norse women with Slavic offspring, but what's the point of doing it? There're much better lands to the South and West, and any tribal union capable of eliminating Norse would deal with southern sissies without breaking a sweat. Heck, even eastbound trek looks more promising, wiping out proto-Poles and settling there (in this case where would not be a "slave" in English, but a "pole").Also, Slavs taking over Scandinavia and Iceland would be interesting.