Very well done!
You did a great job on this psychicpebble! Being an animator myself i have actually 1 thought in particular that could make animating stuff like this easier but It's whatever, just something i noticed.
When you move the heads up and down it looks like you're moving the mouths separate from the head and it doesn't always line up perfectly (and that would be hard anyways). Might want to try embedding the mouths in the head container and then doing the lip sync right there, then when you tween the head around the mouth will stay in the same place, and if you need to move it at specific parts you can do it right inside the main container.
Just a thought though, its really not noticeable its just something that could speed up the lip sync :)