Actually I would say the vikings were not from Finland but from Denmark, Norway, Sweden and parts of North Germany. One hint to this can be found in the Finnish language which is completely different from Swedish/Norwegian/Danish. The last 3 have similarities and speakers of one can often understand and have a basic conversation with someone of the other, however Finnish has almost no common ground with the other scandinavian languages at all.
So you suggesting they really West Russian...................or perhaps the Lost Tribe of Santa's helpers ?