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Actually, I found it! It is slightly different:

[b]tr

Actually it is the Danish version that is trolds.

I looked a little further, and the old norse version is definitely "troll", I even read a saga with troll in it. Icelandic is very close to old...

In icelandic! To be honest I don't know Icelandic, but it IS a Norwegian word and in Scandinavia (proper) the word is simply "troll", this might be true for Iceland too.