untitled furry fighting game has some of that as fighting moves.
one idea I had for a 3rd person shooter was basically if you rocket jump (or similar) you deal damage when landing (works for platformers as well, Yoshis and Bowsers down-B comes to mind), you just need to make the character land on there butt instead of there feet.
though the slowness of actually squashing someone properly makes it more less suitable for faster paced games. it could be suitable for a tactical RPG as a restraining move or a devastating 2 round+ type of move