In Justice League vs. Teen Titans, during the scenes in the hellish dimension, Beast Boy was able to turn into some new kind of creature like a werwolfish-beast, a griffin and an animal looks just like a Genomorph:
Here is one of the G-Elves (Genomorph) from Young Justice:
They look exactly similar except for the colour which is also Beast Boy's trade of being green in all his transformations. So is it a reference to Young Justice or are both referencing some other comic-book entity? Did they ever acknowledge it?