well, technically, PVC is just the plastic they're using...which now is the same plastic used on regular figures, so in essense, all the figs are "PVC". what people MEAN when they say PVC though is a smaller figure in a static pose that's (usually) all one piece.
i think Ken said Thog was like 4", which is just a little shorter than Kermit. i would guess the others to be 2"-3" depending on which one you're talking about. with PVCs, scale isn't always the concern...
hope that helps a little