Ads keep the MarioWiki independent and free :)
The Quacker has the best acceleration in the game. It also has decent handling and drifting. However, the bike itself has fairly low speed and is also the lightest vehicle in the game, which makes it very easy for heavier vehicles to push it around an edge or grass. It is unlocked by winning the 150cc Star Cup. The Quacker has the same speed stat as the Sugarscoot and the same drift stat as the Mach Bike, both of which are medium sized vehicles. The Quacker also has the same off-road stat as the Daytripper.
Additionally, Toad's Quacker has the best acceleration in the game.
Trophy description from Super Smash Bros. for Wii U
Names in other languages