Polly and Rhody are two aunts in the traditional American folk song 'Polly Wolly Doodle'. The song is about a young man who goes off to war, leaving his two aunts behind. The aunts are mentioned in the chorus of the song, which is sung in a call-and-response style. The two aunts are often used as a symbol of home and family, and the song is a reminder of the importance of family and the sacrifices made by those who serve in the military.