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Also question is, is puffer fish one word?
The Tetraodontidae are a family of primarily marine and estuarine fish of the order Tetraodontiformes. The family includes many familiar species which are variously called pufferfish, puffers, balloonfish, blowfish, blowies, bubblefish, globefish, swellfish, toadfish, toadies, honey toads, sugar toads, and sea squab.
Regarding this, what happens if you touch a puffer fish?
The puffer fish has the remarkable ability to expand its body extremely quickly when faced with danger, unavailing it's long poisonous spikes that cover its body. If a fisherman catches a puffer fish, they will never touch the spikes as they are highly toxic to humans and animals.
Pufferfish inflate by rapidly pumping water into their stomach. Studies of the Long-spine porcupinefish (Diodon holacanthus) show it has evolved a stretchy stomach which has lost its digestive function to allow it to puff up. Although puffers have evolved to suck in water, if lifted out they can sometimes suck in air.