I am sure it needs to be refined =)

 This deserved a lot higher place :/

 If it was the long view - it begins to seem that he bouncing (probably from the music), goes to the left )).... Funny

AAH thank you I know exactly what you mean.  I offset the animations between tendril 2 and 4 to give his flapping a bit more variety-- didn't even realize it was fighting the flow so much.  Ill fix it later.  Honestly I think the 3rd one is the biggest problem as its the longest/seems to stick out the most.  Thanks.

@EC: I was trying to show the fact that it's hollow, haha?  Maybe if I put a tongue in there or something.  It was just tough to put anything in that space without muddying up his shape too much 

 

Love the animation! There is just one thing which bothers me slightly; the part where a wobbly bit meets the jaw should stay the same. For example, the 2nd one along is great as the place where it meets the jaw is constant. All the other three, especially the 3rd one along, are flapping about a little too much.

Good animation! What if you try not to use transparency in the mouth?