Cucumber

From the Super Mario Wiki

The Cucumber is Yoshi's second original kart in Mario Kart DS. It is a dragster-styled, green car, and somewhat akin to Toad's 4-Wheel Cradle. It has average speed, low weight, drift, and high acceleration, handling, and items.

Mario Kart DS Karts
Character Standard Kart Primary Kart Secondary Kart Mario Standard MR B Dasher Shooting Star Luigi Standard LG Poltergust 4000 Streamliner Peach Standard PC Royale Light Tripper Donkey Kong Standard DK Rambi Rider Wildlife Bowser Standard BW Tyrant Hurricane Toad Standard TD Mushmellow 4-Wheel Cradle Yoshi Standard YS Egg 1 Cucumber Wario Standard WR Brute Dragonfly Shy Guy Standard SG N/A N/A
Unlockable Karts Character Standard Kart Primary Kart Secondary Kart Daisy Standard DS Power Flower Light Dancer Waluigi Standard WL Gold Mantis Zipper Dry Bones Standard DB Banisher Dry Bomber R.O.B Standard RB ROB-BLS ROB-LGS