It is unlikely he was a Teutonic Knight. The Teutonic Knights had no reason to venture to Finland. It is a tiny bit more possible it was a knight of the Livonian Swordbrothers - which eventually became part of the Teutonic Order.
The most likely thing is that it wasn’t a crusader at all - since no convincing evidence is produced that he was a crusader - and that he was Finish or Swedish.
The crusades in Finland, if they can even be called that (some doubt they happened) were by the Swedes.
Ironically there are more Teutonic Knights in Finland now than 800 years ago: https://www.facebook.com/TeutonicOrderCommanderyofFinland/
But it’s next to the Baltics.
The baltics were pagan lands and the destination of the northern crusaders