Is there room for unofficial stuff here, Havard?

If so, my two passes at races unique to Thorn's World That Was, on the blog:
(think a bit-more-organic Warforged)

Havard, you mentioned hairfoot halflings, but those should probably be lightfoot. Based on the art and race descriptions for D20 and 4E Blackmoor, I would say the Docrae are lightfoots, and Blackmoor halflings are stouts, but only in terms of mechanics.

Their lore is obviously different, and Docrare are not halflings but "halfling-like" humanoids, so I suppose it might make sense to create a separate 5E race for the Docrae. But I would use the existing 5E halfling races as you have done. That is obviously much easier. :mrgreen:

I don't really know what the heck a tiefling is, except that it is supposed to be some kind of half or part demon/devil, like a cambion. (Why they didn't just call them cambions is beyond me). But there is some precedent for the half demon found in the Anakim of Adventures in Fantasy. So tiefling may not be totally alien to the setting, depending how you handle it.

When I ran my 5E game set in Blackmoor I let Tieflings come from the decadent slowly collapsing empire to the south. I had the Empire crumbling from within and it's Nobles summoning and fornicating with demons,since Tieflings are descended from Demons. Some of Blackmoors corrupt Nobles kept Tiefling servants as status symbols.