By definition, if Finland is included, we’re talking about Fennoscandia and, if you add in Iceland, it’s the Nordic countries.
Denmark is usually included in Scandinavia, but technically it isn’t part of the Scandinavian peninsula.
However, I know that outside Europe the distinctions aren’t all that important.
I would recommend soppa365.fi for your recipe needs. It compiles recipes in Finnish from several sources. You can usually find something that works with little to no adjustment.