>>373914834
Sure thing. There's three ways to do it. 
1) Particle spawn texture sheet
2) Multiple Mesh squares in front of mouth
3) Multiple Materials swapping on the mouth area.
4) Material property animation texture sheet
Since we're strapped and limited mesh wise then the next best thing would be the multiple material one (3) or (4) for the optimized version of this.

Would be a good idea to make a guide for this. I can get to that. EASTER is very far. I'm gonna assemble a team to do a guide on this so everyone can have something to work on towards Easter for each step of the way to making a very simple 256 avatar with visemes.