The Norwegian faction has the peasant placeholder. I haven't checked, but I imagine it's the same story with any faction which uses Longboats.

And the same thing occurred with Denmark too, when I sieged Oslo and the sieging army was attacked by Norwegian forces. In the army, I had European Spear Militia, European Peasant Archers, a General and I think maybe some Viking Raiders possibly. I would imagine the Norwegians (and indeed the Swedish in the Norwegian problem) had much the same sort of kit.
Basically, whatever forces you start the game with as either Norway or Denmark it occurred with as I had hired no mercenaries at that point with Norway. I did hire two Mercenary Spearmen as Denmark, though I doubt it is them.

Also, a point for Denmark - When you start the Danish campaign, you have a Danish princess, Cardinal and Merchant...all of which spawn on the Iberian Peninsula. Quite a way away from Denmark! :P