I like “Vordern Legion” quite a lot. I’m not to sure about the ghouls, I agree Totenesser sounds a bit flat, but the “Lab” suggestions work a little less to me, like a shorthand for labrador or laboratory.
Perhaps, Lesser/-/Greater Labener?
Or something a little more on the latin/english side a Carrion Imp/Fiend/Horror?
Yeah the orks/goblins are a really hard to see as anything else given their look.
I could imagine folk-lore trolls being part of the setting…
…but their look is completely different.
And I honestly think the Orks kind of work, it’s more the goblins that feel a little odd, looking very old-school D&D, but acting far too competent in-game to be the generic low-level enemy I associate it to.