There are just under two hundred species of animals known as pufferfish. Nearly all are marine and most are found in tropical seas. In New England we have only one species, the Northern Pufferfish (Sphoeroides maculatus), although at least two southern Atlantic species can be found as strays.
Puffers are fierce predators, but are known more for their protective behaviors, the most impressive of which is their ability to inflate themselves with air or water, increasing their size dramatically. Unlike many land predators, fish generally swallow their food whole. If it can't fit down its throat the potential prey is passed up (there are, or course, many, many exceptions to this rule).