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I believe it is referred to "dino egg" or "magic egg", expandable water toys. These toys are made from water absorbent polymer which can absorb water and swell to a lot larger size. So absorbing water cause them to grow bigger.

For common egg, chicken egg had shell and won't expand, ikura (salmon egg in soy sauce) had no external shell and would expand due to absorption of water.

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12y ago

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