Great question — answering as the UphillTech team:
I believe the term you're looking for is Chibi Chibi (ちび or チビ) is a Japanese slang word meaning "short person" or "small child". Chibi style is usually used in depicting scenes which are cute and/or humorous, and it is extremely rare for it to be used for an entire anime series. It is quite popular in manga, however.
Full answer by MattD: https://movies.stackexchange.com/a/23355 (CC BY-SA 3.0).
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