Oxtongue is a term used for the edible herb called "Bistort" or "Polygonum Bistorta." The herb is known for its long and narrow leaves, which is similar to the shape of an ox's tongue. However, there are other terms that are used as synonyms for oxtongue. One of these is "snakeweed," which is derived from the herb's historical use in treating snake bites. Another synonym is "adderswort," which is believed to have originated from the herb's use in treating snake bites. Some other names for oxtongue include Easter-ledges, dragonwort, pudding grass, and patience herb. While these names may vary, they all refer to the same herb with medicinal properties.