Norway as two official languages for ATC, English and Norwegian. Pilot decides what language shall be used in communication.
My humble guess is that about 99% of all "norwegian pilots" use english as primary language, but might be a bit different on small, privately owned airfields.
All TWR/APP controllers is fluent in both, and for the time being, the ACC as well. (The latter, however, is about to be "English only", mainly because the government/CAA/ANSP would like to open for foreign controllers..)