Why is Ilkley Moor not called a fell?
What's the Long Mynd called?
Black Hill? Kinder Scout? Bleaklow? You won't find a single "fell" in North Wales.
There are loads of dales, riggs, pikes, stangs, becks but I can't find "fell" once in the NYM. I'm guessing that "fell" is Norwegian Norse rather than Danish Norse as it was vikings from Norway via Ireland who settled in the west of the country rather than Danish norsemen in the east.