What kind of creature is this? At Pulau Pangkor Malaysia.

This is the description submitted to The Black Vault (grammatically uncorrected):

Any one know what kind of species is this? As i meet him?… her?… it at Pulau pangkor beach. It kind of weird, every legs with pincers. It got a baloon on it’s head, the baloon with get big and small when it breathing.

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