A rigid head made of plastic works best for stylised designs with a simpler look, but other puppet designs will call for a bit more mobility in the face. Because human and animal faces are often just as flexible a piece of design as the rest of the body, some puppet faces will be rigged with armature pieces to be animated. Posable paddles, wires, or other mechanisms can be built to simulate movement of the jaw, lips, brow, and eyebrows of the puppet face. In many cases, a movable face armature will be covered with a flexible material like foam latex or silicone. This will cause the surface of the face to bulge and stretch like real skin for the facial features that are manipulated underneath. Pulling and pushing on a jaw or an eyebrow paddle on the surface of the face creates a unique range of possible emotions for the animator.
Information sourced from: https://www.youtube.com/watch?v=pbWW8vigrF0
http://www.awn.com/animationworld/advanced-art-stop-motion-animation-building-puppets-part-4
http://www.stopmotioncentral.com/blog/stop-motion-puppet-replacement-mouths/
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