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I don't think they're "anthropomorphized freshwater crabs". They're entirely humans, they just use crab claws as weapons. At some point we see actual crabs being scared of them. They're just miniature humans, possibly water faeries, as we see flying faeries passing by at the beginning of the film. -- Kumagoro-42 ( talk) 02:36, 23 June 2021 (UTC) reply