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The Soundfrog is a character featured in the game Super Mario Maker. Its appearance is a green, cartoonish frog, similar to the one found in the Mario Paint composer. By tapping the Soundfrog icon on the left-hand side of the editing screen, the player can access a variety of sound effects to use in their course. Soundfrog is eventually unlocked in the game alongside the sixth shipment of editing tools.
The sound effects can be placed onto the backdrop and will play if Mario touches them, but they can also be placed onto objects and enemies and will play the noise if the object does a specific thing (for example, hitting a ? Block from below). Most sound effects create visuals and will appear as the sound itself plays. Additionally, there is a sample course in the game called "Sound Effects" that shows the player how sound effects work and what they can do.
List of sound effects
List of sound effect applications