If the Fins are Scandinavian, then the Turks living in Thrace are European.
The Turks living in Thrace
are European,
because they are in Europe. Although I am aware I could be leading this thread into a discussion about semantics, terms like "European" and "Scandanavian" should be used to refer to geographical boundries, because that is all Europe and Scandanavia are: imagined political/geographical regions.
Nationality is an entirely different concept, as you could argue that the Basques arn't Spanish for instance, but neither Europe nor Scandinavia are nations. If you really want to find out whether or not Finland is part of Scandanavia, all you really need to do is see whether or not it is part of the Scandanavian Penninsula.
It should be pointed out though that
politically Finland is often attributed to Scandanavia because of its close relations with those countries that lie on the Penninsula, and its close, almost ambiguous proximity.
My point though is that culture and language are irrelevent in determining whether or not Finland is in Scandanavia, because language and culture do not define regionality, and Scandanavia is a region, not a nation.