As someone growing up in relatively close contact with Finnish, I can assure you that there's no real common ground between Scandinavian languages (Swedish, Danish, Norwegian) and Finnish. There are loan words, but they are few and far between and in any case does not make for any mutual understanding. I've been so much to Finland that I would really like to learn to at least understand the language, instead of relying of memorized names of foodstuff and the like. Just have to tackle Japanese first.. (and I consider that one an easier operation)