Mini pufferfish (chocolate doll) can swell up.

Pufferfishes (Tetraodontidae; pufferfishes), commonly known as pufferfish, are the collective name for fish in the family Pufferidae of the class Bony Fish. (Note: There is an error in the name of the pufferfish, but because of its wide spread, many places call it pufferfish. In fact, pufferfish is a mammal, so please distinguish it. Similar to the cat and panda, when the wrong name is accepted, it is called a panda.) The puffer fish that has been eaten in China since ancient times all live in rivers. They are named river "dolphins" because they make a chirping sound similar to the sound of pigs when they are caught out of the water. There are also "bubble fish", "blowing fish", "puffer fish", "air drum fish" (Jiangsu and Zhejiang), "good fish" (Guangdong), "chicken hug" (Guangdong), "turtle fish" (Guangxi), "street fish" (pronounced in Minnan dialect) (Fujian), "wax head" (Hebei), "puffer fish" and other names. In ancient times, it was called "puffer fish". It is a warm temperate and tropical offshore bottom fish that inhabits the middle and lower layers of the ocean. A few species enter freshwater rivers. When encountering external danger, their entire body floats to the surface in a spherical shape, and at the same time, the small spines on their skin stand up. Self-defense. Common ones include Takifugu rubripes, T.fasciatus, Lagocephalus inermis, Chelonodon patoca, and Aronthron nigropunctatus. etc.