Rolly-Polly bug is another name for the Woodlouse. These little crustations are known by many other names such as cheese log, pill bug, rolly-polly, roll up bug, salter, sow b…ug, and armadillidiidae. They are not insects. Insects have only 6 legs. rolly-polly bugs have 7 pair of legs (14 legs). Making the world better, one answer at a time.