I think Frozen could have fit in Norway. If the ride focused on the IP's roots to Norse mythology/folklore, and/or Scandinavia.
That's not to say I think it'd be the best fit, or even a really good fit for the pavilion, but that I think it would be thematically appropriate. The fact that Arendelle is fictional I don't think is the problem, if there was a ride exploring Norse mythology that was set in, say, Valhalla or Asgard (not Marvel Comics), I think no one would have a problem. Rather, I think if you gave it the Pandora treatment, it could be at least appropriate, or servicable.
As it stands though, it's just a Fantasyland, storybook dark ride. Focuses on Frozen, not Norwegian anything. In Fantasyland it'd be solid, in WS it is not.