How were the two cartoons "Thief" and "Two Generations of Love" made?

Puppet animation and clay animation are both called stop-motion animation.

The so-called freeze-frame animation is to shoot the objects one by one and then show them continuously, thus making them look like real people or any strange characters you can imagine.

As for the expression you mentioned, in fact, a character has a set of corresponding expressions and "equipment" in the production process, and the "equipment" prepared in advance will be replaced every time he shoots.

You can look at the encyclopedia's explanation of stop-motion animation:

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