Alrighty, so I just had this quick idea for a down B: I thought that perhaps he'd liquefy himself, and then anyone who steps on him would slip and fall. Then, we he rises to go back into his normal form, anyone who had tripped and fallen atop his liquid self would be hit (by his re-forming body) and be sent a short distance.
Might need a bit of playing around to whoever's animating (I can't). He's stay in puddle form for a good three or so seconds for example. Also, when he actually goes INTO the puddle form... I believe only the first, third, fifth and sixth sprites are necessary, to make it fast. Then, use all of the sprites backwards to make a fluent rising motion.
EDIT: Uploaded a newer sheet containing a drawn example of what I was thinking for an interesting side special move. He grabs the ground with his tongue, and swings himself in a circular motion forward, coming crashing down on the ground ahead, before rolling in an attempt to stop himself ( ) as you can see. I know the tongue looks horrible, and what-not, but yeah, It's just an example really. I'm not too flash at spriting keep in mind.