Absolutely Not. Tomato juice and Clamato are not the same.  Clamato is a type of tomato-based beverage made from reconstituted tomatoes, water, clam broth, vinegar, salt, sugar, and spices. It is often used as a mixer for alcoholic beverages.  Tomato juice is a beverage made from fresh tomatoes and usually does not contain clam broth but can season with some herbs or spices.