Perhaps you're thinking of:
* A wild boar: These animals are known to dig burrows, especially young ones. They are called "pigs" but are actually a type of wild pig.
* A groundhog: Groundhogs, also called woodchucks, are rodents that are famous for their extensive burrow systems.
If you have more context, such as where you heard the term or what it was used for, I might be able to give you a more specific answer.