Emeriss, Lethon, Taerar! Images from Wowhead.

the fuck are these

I believe they’re green dragons who’ve succumbed to the Emerald Nightmare.  They might be part of a council-style boss fight?  Or maybe just a rarespawn thing.

oh shit what if they bring back the world dragons except they’re nightmare-styled this time (shh I want to believe)

They brought back Ysondre,  Emeriss, Lethon, and Taerar as a boss encounter in the Emerald Nightmare instance, unsurprisingly named “Dragons of Nightmare” and they those models now: