1) Diodon hystrix 2) Fish 3) Porcupine fish 4) Spiny puffer 
Chilomycterus Cyclichthys Dicotylichthys Diodon Lophodiodon Porcupinefish are medium- to large-sized fish, and are found in shallow temperate and tropical seas worldwide. A few species are found much further out from shore, wherein large schools of thousands of individuals can occur. They are generally slow. Porcupinefish have the ability to infla...
[n] - spines become erect when the body is inflated
porcupine fish noun spines become erect when the body is inflated; worldwide in warm waters