|The Frog's sprites, front and side.|
|Gender||Male (Referred as father from the Tadpoles)|
|Role in Story|
|In Game||Used to activate lever on the third floor; key item for the mirrored room; sacrifice to the snake for Viola to progress.|
|In the Book||N/A|
|In Game||Dead, eaten by a large snake.|
|In the Book||N/A|
The first puzzle, that is solved with the frog, involves having it cross a narrow bridge in the 3rd Floor Hallway to flip a switch. Later, the player has to sit the frog down on a chair to make a mirror image in the Mirror Room. Finally, the player is forced to feed the frog to a hungry, giant snake to get to the next room.
In Extra Difficulty Mode, when the player tries to feed the frog to the snake, the frog will jump out of Viola's hands and hide in a narrow hole in the wall. The only way to get him out is to insert the stuffed frog from the Mirror Room into the Snake Room, which will cause the snake to ram the walls and break off part of the wall, then Viola can catch the frog and force it into the window.
When you leave the Snake Room, you may see what some players call 'The Ghost of the Frog.' If you go back into the room with the 'ghost' before going to the Mouth Hallway, the floor suddenly changes into what may be an image of intestines. This effect does not harm you. Viola will simply walk over it as if it was normal flooring, and only appears the single time you reenter that room.
If you return to the Frog Room upon sacrificing the frog, the pool will be solid black in color. If you check the note, a large right hand will emerge from the pool and crush Viola to death.
Tadpoles are heavily implied to be Frog's kin. They will claim their father was eaten by a snake; on their third response, they claim that you killed him, and consequently drown you in their pool. When you wash the Red Shoes, they will die as well.