Soundfrog

Soundfrog is a character featured in Super Mario Maker and its Nintendo Switch sequel, Super Mario Maker 2. 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.

The Soundfrog itself is also one of the creators of the "Official" courses in the game. Its first course, Muncher Mayhem, was released a day after the game's version 1.20 update.

In Super Mario Maker 2, Mario can receive jobs from Soundfrog in Story Mode. In Story Mode, it dances to create "atmosphere" for the castle and will offer to dance on command once its jobs are completed. A zipper appears on its back, implying it may actually be someone wearing a frog costume.

Super Mario Maker 2
Soundfrog and sound effects return in Super Mario Maker 2 with new additions. All of them are now categorized in five different groups similar to the course elements: feelings, stingers, reactions, animations, and music. When playing in an underwater or Ghost House course set at nighttime, certain sound effects serve as temporary light sources when they are triggered.

Sound effects in bold are new.

Feelings
The feelings category is represented by a smiling face and colored yellow.

Stingers
The stingers category is represented by a "!?" and colored red.

Reactions
The reactions category is represented by split arrows and colored green.

Animations
The animations category is represented by sparkles and colored purple.

Music
The music category is represented by a vinyl record and colored blue.