The Shaker Brothers are Solt and Peppor (and possibly Ketchop). In Japanese, they are known as Sugarl and Solton (シュガール & ソルトン). These two tend to serve as "Tutorials" on new concepts during Chrono Cross except in the final confrontation with them. Throughout the rest of the game, they unknowingly give advice on how to work element traps and the like.