I love me some D&D gnomes. Probably around one fourth of my D&D PCs have been gnomes. Gnomes have a prominent place in most of my campaigns. Love me teh gnome.
Nonetheless... there are nits to be picked!
Draupnir ("Dripping") Odin's magic arm-ring, which every 9th night, dropped eight new bracelets, was created by the gnome Sindri. As I recall, they were master craftsmen who create much of the other magic of the Asgardians- Sif's hair and possibly Mjolnir as well.
I have never heard of Sindri or his kin described as gnomes. It's
duergar ("dwarves", modern spelling "dvergar") or it's
svartálfar ("blackelves" or "darkelves"), depending on the source. I don't doubt that it's been translated to gnome sometime, but only as an alternate term for the Norse dwarf.
[...] Foddenskkmaend is their name in Iceland. [...]
That's not Icelandic. I mean, it could be a horrible mangling of some obscure spelling, but no matter how I try to read it or sound it out, it never even vaguely sound Icelandic. That term only seems to pop up again and again in identical bodies of text about gnomes, that seem to have propagated around the internet. I found one link that suggested that the term was Faroean, but it doesn't look very Faroean to me either.
There is no gnome in Icelandic folklore. There are dwarves, elves, trolls and all kinds of critters, monsters and undead, but the closest we have to a gnome is the "búálfur" ("house elf"), which is a trickster elf that hoards all the stuff you lose around the house (like socks or your keys--that kind of thing). Every household is supposed to have one.
We have adapted the word gnome to "gnómur", but only in recent years. I think it originates from a translated/dubbed cartoon about gnomes that was shown here in the 90s.
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EDIT: Whoah, that conversation moved fast!