From the Super Mario Wiki
Wooden cutouts, also known as boards, are objects designed after various objects and entities that first appear in Super Mario 3D Land.
Super Mario series
Super Mario 3D Land
Boards first appear in Super Mario 3D Land, where they can have the design of a Goomba, a 1-Up Mushroom, or a Warp Pipe (referred to as Goomba Boards, 1-Up Mushroom Boards, and Pipe Boards, respectively) and occasionally give the player items when broken. They block paths but can be jumped on or broken using either Tanooki Mario's tail, a roll, or a Ground Pound. In World 8-Bowser: Part 1, there is a board shaped like Princess Peach at the exit of the castle when Bowser is defeated for the first time, but Bowser shows up and crushes the board. If the player replays the level, only some fragments are there.
Super Mario 3D World
A board shaped like Bowser appears in Super Mario 3D World, in the level, Shadow-Play Alley, which scares Captain Toad. Touching the board caused it to fall and break. Captain Toad gives the player a Green Star after the board is destroyed.
Mario Kart series
Mario Kart 7
Several Goomba boards appear in Mario Kart 7, in the course Piranha Plant Slide. They can be broken by driving into them, and will respawn some time after. There is also one bush board that stands between the fences in an off-road area at the end of the course.
Mario Kart 8 / Mario Kart 8 Deluxe
Mario Kart Tour
Wooden cutouts reappear in Mario Kart Tour, where they block shortcuts. Wooden cutouts of Piranha Plants appear in GCN Yoshi Circuit and Paris Promenade 1, while Boo versions appear in DS Luigi's Mansion and SNES Ghost Valley 1. They can be broken by driving through them or using an offensive item. If a player drives through a wooden cutout without using a Mushroom or without being invincible, they spin out and lose coins.
Both the Piranha Plant and Boo versions of the wooden cutout are counted for the "Take out 5 Piranha Plants." challenge.
Names in other languages