Cat's Eye Marble
Trinket has possessed a jack-o'-lantern!  It has ears and a tail cut from pumpkin scraps, while its feet are simply four bumps on the pumpkin's underside.  All these features are just stuck on one big round pumpkin body, head and torso as one, so you can only imagine how it might waddle around.  It stands and gives you a cheeky little stare, a warm glow shining through its carved-out face, but hold on: it takes off its cap and there's no candle in there... just candy?

But wait: if I'm full of candy, then what's with the glow?  An exercise left to the reader.