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If you know the genus of the insect larvae that makes those cocoons, please post a comment!
Nhộng Tằm worm cocoons (Vietnam)
Nhộng Tam worms are a delicacy in some parts of Vietnam, but I didn't get a change to try that for diner.
Those are not Silkworms (Lepidoptera), but they produce a similar cocoon that is harvested by the tribe people in Northern Vietnam.