Frogs can be found in some levels. After waking up, the frog replaces all the pieces of one color on the game field with the piece it's holding. Frogs can also change the color of other elements, such as timer pieces, electric rays, or squids. The color of the piece the frog is holding determines the new color of the element.
Frogs can't be moved. To wake them up, make matches or explode power-ups next to them.