Ive been searching eBay to Google typing in what I know about this toy and nothing has ever come up...
This toy came out sometime in the early-mid 90's. It's a skull with interchangeable parts... you can add a nose, different teeth, different colored eyes... and you can make it talk with two levers at the base of the neck... make it look different directions and make its mouth moove. You could also add slime in its head and push a button to make it drip out of its nose. It also came with clay so you could make skin for it... does this ring a bell for anybody?? Ive seriously been trying to figure this out for over a year... please help!!

Doctor Dreadful Food lab sounds right if you could eat the slime

Monster Face by Hasbro, I forgot all about that, I have one, its sitting on my dresser with a Santa hat on. One of my favorite toys.

I Think I no, I mean I wasn't alive then, but Ive heard of it and I think its called Monster Face. My old teacher had one as a kid, she was telling us about it in a biology lesson, we kind of went of subject from the human body to an old toy. Im pretty Sure it is Monser face because that's what my teacher called it and it sound the same, and I'm sure it was by Hasbro.
Glad To Help x