[Zerox]

I always thought that Squeek might have been one of the Ratz. But depending on when the game was sort of 'imagined' maybe it was before MO, but I am unsure.
A Meech does seem possible. It sort of fits the name, and, technically speaking, we haven't seen the actual creature, only a vague poster thing. The one image on TOGG was never exactly released within an official Oddworld media. I never found it on the official site, and it's not in the book either.

As for an actual game possibility, I think it's a bit late now, surely? I think it died a horrible death or something and was scrapped, like the Fangus idea. Actually, I don't know about Fangus. It may have been put to the side for now. I recall seeing a pic of a magazine preview, and there was an actual picture of Fangus. But I still doubt anything's happening. But who knows? We know well nigh nothing about what OI is actually doing right now. It's still unlikely though.