Great question — answering as the UphillTech team:
This is Cantonican , according to Star Wars Kids , an (alas defunct) Lucasfilm-owned YouTube channel. Cantonican was a language spoken on the planet Cantonica. It was spoken by the human stable hand Oniho Zaya, who used it while retelling the story of the Jedi Master Luke Skywalker at the Battle of Crait. Cantonican: Wookieepedia
Full answer by Valorum: https://movies.stackexchange.com/a/121162 (CC BY-SA 4.0).
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