I searched "star wars chibi" for fun, and I came across these ones, but I don't recognize this character:
Who is that?
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Klaatu was one of the guards on Jabba's skiff:
And no, he's not a Weequay; he's a Nikto1 (Kadas'sa'Nikto, technically).
The image linked in the question is a composite of the "Chibi Star Wars Alphabet" series by artist Joe Wight. The name of the character can be found on Wight's DeviantArt page.