Played hockey with several Finns. They always seemed grumpy about something. The Norwegians and Swedes I played soccer with always had a more cheerful disposition. They always made fun of the Northern Finns, saying, "You'd be grumpy AF too if you had to deal with Winter for 7 months every year!"
I'm Norwegian, and the Norwegian stereotype of Finnish people used to be that they are dour and introvert. And we're by and large culturally a lot less outwardly cheerful to people we don't know than the Danes.
Sometimes Norwegian TV would show Finnish dramas while I was growing up in the '80s, and the standing joke was that the typical Finnish drama had two guys hiking through the forest, one of them saying something, and then half an hour more of hiking before the other would reply. I don't remember whether that was accurate (it's not as if I'd have kept watching), but I suspect not.