Lost Tale of a Lost Dwarven Tribe and Thranduil?

[Legate of Amon Lanc]

Oh, really thank you, Formendacil. I originally thought that there could have been some tribe in the Grey Mountains, you know, like in the Blue mts. the tribes were in pair, there could've been someone with the Durin's folk...

Why I have thought that there were some Dwarves apart from Durin's folk in the Grey Mountains: I think that Longbeards started to settle in there around 1980-2210. According to the Appendices:

1981 Náin I slain. The Dwarves flee from Moria.
2210 Thorin I leaves Erebor and goes north to the Grey Mountains, where most of the remnants of Durin's Folk are now gathering.

But Scatha the Worm was killed by Fram son of Frumgar. We don't know exactly the dates of his birth and death, but we know when his father Frumgar led Éotheod to the north:

1977 Frumgar leads the Éothéod into the North.

It is quite possible that Frumgar was in his best years at that time, and it would seem logical that Fram might have been born after the Éothéod settled down in the new lands. So if Fram was born around, let's say, 1980, I'd guess him killing Scatha between 2200 and 2220 (possibly later than earlier). But this would make 40 years at best from when the first, really probably only few Dwarves, came to Ered Mithrin. Do you think there was enough time for the Dwarves to settle down, acquire a treasure and then be robbed by Scatha of that treasure (which would include probably eating some of the Dwarves)? Of course, they could have brought some treasure with them from Moria... well, after all, 40 years is a long period... but anyway, what I wanted to suggest was that the dwarven treasure Scatha had could have predated the settlement of fugitive Moria-tribe(s), thus, come from some other Dwarves who were in the area before?

And those Ironfists and Stiffbeards you mention, couldn't they have lived close enough to make contact with Thranduil? If you say "as far as Gundabad from Blue mts. or even further", the least possible distance is about 600 miles, which is about the same distance as from Gundabad to the eastern end of the Iron Hills. Ironfists???

Just by the way, where is that information about Dwarven tribes available? It is in HoME? Where?