Pogs are small, round discs that became popular in the 1990s. They were typically made of cardboard or plastic, and printed with a variety of designs. While "pogs" is the most commonly used term for these discs, there are several other synonyms that have been used over the years. Some people call them "milk caps," as they were commonly used as seals on milk bottles in the past. Others may refer to them as "tazos" or "flippos," as these were similar discs that were marketed under different brand names. Overall, pogs are a fun and nostalgic collectible that can be enjoyed by people of all ages.