Oxford describes a herd of wild pigs, or swine, as a sounder. In fact, the name of a group of wild hogs has more to do with the age of the animals than the noises they make. A group of young pigs, or piglets, is often referred to as a drift, drove, or litter. A group of older pigs are called a sounder of swine, a team, or a passel of hogs.
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