What's the best way to give a character a 2D mouth texture?

[Ashes]

I wanna give this character a texture as a mouth instead of the usual opening, how do I give him an animatable mouth texture?

[joseph]

Shrinkwrap a Grid, put the mouth texture on the grid. You can animate it a variety of ways- with a texture atlas and keyframed UV coordinates, shape keys, etc. It depends on the look you want

[Ashes]

Keyframed UV Coordinates seems to be working pretty well. Thanks!