It's generally considered an implicit rule that humans (Hyur) can interbreed with just about any fantasy race for... pretty obvious reasons I shouldn't need to explain. As long as they can be fairly identified as mammals, anyway.

For the record, while half-elves are the most common half-breed races in fiction thanks to them showing up in both D&D and The Lord of the Rings, half-orcs are about as common in the former and there's even the odd half-dwarf. There's even freaking half-dragons, man! If it's sapient, human shaped and close enough in size (or can assume a human form), and has a [splat] the humans (or human analogues) can probably have children with it. (Hell, there's a racist insult against Highlander Hyur involving telling them their mothers are Sea Wolf Roegadyn! Which, to speculate, could be true in some cases! Maybe!)

The rest is... well, up for debate. Lalafell seem unlikely given... physiology. I won't delve into the anatomical spiel again unless explicitly asked.