Tonguefish is the common name for several species of flatfish that are found in freshwater and saltwater habitats around the world. Some synonyms for tonguefish include sole, flounder, plaice, dab, turbot, and halibut. These species of fish are characterized by their flat, elongated bodies and their eyes that are located on one side of their heads. They are bottom-dwellers and are often caught by commercial fishermen for their delicate white flesh. Tonguefish are also popular among recreational fishermen and are commonly used in dishes such as fish and chips, fried fish sandwiches, and baked fish meals.