Moving-mouth Puppets
A mouth puppet is a figure whose mouth is opened and closed directly by the puppeteer's hand. The fingers usually control the upper part of the head while the thumb moves the lower jaw. This arrangement allows the mouth movement to be synchronized precisely with the character's voice.
It is also known as a moving-mouth puppet or articulated-mouth puppet. It is sometimes called a Muppet-style puppet in everyday speech, but Muppet is not the generic name of the technique. It identifies the characters and brand created by Jim Henson. The Muppets popularized this system on television, but they did not invent it: the World Encyclopedia of Puppetry Arts documents earlier examples among glove puppets and figures with movable jaws.
In many designs, one hand controls the head and mouth while the other operates one or two rods attached to the character's hands. This combination is called a hand-and-rod puppet. Not every mouth puppet uses rods: some have directly manipulated arms, live hands, or internal mechanisms.
Lip synchronization is not a matter of mechanically opening the mouth on every syllable. The movement has to follow the rhythm, stresses, and pauses of the performance. On camera, the direction of the gaze, the body's breathing, and the position of the head are equally important. Because the technique is so expressive in close-up, it is widely used in television, advertising, film, and children's media.
Jim Henson played a decisive part in developing the technique for the screen. The first Kermit was built in 1955 for Sam and Friends from a wool coat, denim, and eyes made from ping-pong balls. The head was flexible rather than rigidly stuffed, so small movements of Henson's hand could subtly change the character's expression.
In summary: a mouth puppet is defined by the hand-operated movable jaw and by its ability to coordinate voice, gaze, and gesture in front of the camera.
Sources: World Encyclopedia of Puppetry Arts: Glove Puppet · Smithsonian: Original Kermit Puppet
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Other puppet techniques
Rod Puppets (47), Body Puppets (28), Marionettes (23), Animatronics (22), Glove Puppets (18), Ventriloquist Figures (16), Bunraku-style Technique (3), Shadow Puppets (2), Finger Puppets (1)