Scientists believe that the hog has existed for at least 45 million years.Hogs go by many names. They are known as swine and pigs. Male hogs and some kinds of wild hogs are called boars. But, there is nothing boring about the hog.Females are called sows and young hogs are called piglets.Domestic or tame, hogs are a food source on every continent except Antarctica. Wild pigs can be found in forests, meadows, and swamps around the world.