nope it didn't do it... at least, I never saw it.
but the spectrum look like a rochart seen in AO, witch would be an anachronism.

The rock-art of the ghost was in AO at the beginning of Paramonia.

spotted it 2 times in paramonia

Of the Oddworld universe, yeah, but not of every single game screen. :p I recognised the ghost from Paramonia, but not the 'Fleech'.

don't think the fleech rock art is in the game...