I though tthey didn't even think of whether the Legion was canonor not until they considered putting them in a game...
But maybe they could make a new creature, similar to Van Buren Trogs but with a different name.
Don't know why Bethesda named then Trogs, though. It's short for troglodyte, meaning "cave-dweller" and/or "unsophisticated". While The Pitt Trogs might be cave-dwellers (more like hiding in the dark) and unsophisticated (more like brutal savages), the term troglodytes fit better in with the Van Buren trogs - hillbillies who sought shelter from the Great War in caves in the mountains, adapted so well to it that they became cave-dwellers and, well, unsophisticated they were even before they mutated (lost all their melanin, what gives the skin, hair and eyes their color) and got sensetive to light. But at least they aren't hostile, I would just think them as big, dumb and pale people, ugly to look at, but with good intentions. They wouldn't crawl and they would wear clothes, they're still humans. They wouldn't be cannibals, though they would probably eat a lot of nasty stuff (like anything in the wasteland
isn't nasty.) They would be able to speak english (although they maybe would speak like you can do with low Intelligence at Helios One, or just with a stereotypical hillbilly accent mixed with a bit of ogre.)
Playing different races would of course come with different unique race-only traits (and perks), beside how wasteland inhabitants will treat them. So a trog would have some kind of Trait similar to "Night Person" but with bigger effects and of course a down-side. A penalty to Endurance, Strength, Agility and Perception, and probably some skills too, in brightness, but a bonus to them in darkness.