Whatsit: Polka Dot Clam?

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Whatsit: Polka Dot Clam?
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Squee! Spotter: Unknown (via Alistair Merrifield)
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This widdle polka-dotted, sea squee is super cute, but what is it? Do any of you squeeps know what kind of fashionable sea creature this whatsit is?

-Sally Squeeps