I have not heard of any Kjolen Mountains, and as part of a local SAR team, I think I should've known about it if it existed.
Kjolen would mean "the skirt", for the anglophones reading.
Were you previously aware of the term "Kjølen" to refer to the (Northern) Scandinavian mountain range? And if so, when you wrote
> I have not heard of any Kjolen Mountains,
were you really distinguishing between Kjolen and Kjølen? Are you a native Norwegian speaker?
I understand that ø is a "distinct" letter in Norwegian, but to my uneducated eyes/ears it sounds similarly baffling to a French speaker not recognizing the "Pyrenees" because they're used to "Pyrénées".
Just to take a random example, if you were to say "Bird Peak" instead of "Bard Peak" it wouldn't be immediately obvious what you meant.
I'm a Swedish native (mutually intelligible with Norwegian), and yes, when I read, "o" and ø/ö are very different and distinct letters.
We have 3 different "special" letters in Norwegian, all of which have their own "latinifications", so it can sometimes be difficult to see when it has been done. (ø to o, æ to ae/a/e, å to a/aa)
Incidentally, Kjolen and Kjølen are both nouns of their own. (kjolen means "the dress" as in what a woman could wear. kjølen can mean "the fridge" as in "put something in the fridge"/"put something in a cool place")
I could be wrong, but I would guess "kjølen" would translate to the "the keel" in this case? Perhaps refering to the shape of the mountain range looking like a keel up-side down.