Piggies, a slang term for pigs or piglets, can be substituted with different synonyms to add variety to your writing. Some of the most common synonyms include hogs, swine, squealers, porkers, and piglets. Additionally, you could use less common alternatives like shoats, gilt, barrows, or boars. These synonyms can be used to create specific meanings or add descriptive language to your writing. For instance, "The farmer tended to his swine carefully" provides a different visual image than "The farmer played with his squealers in the mud". Using synonyms helps avoid repetition and engages your readers with diverse vocabulary.