Skull Carts are items found in Donkey Kong Country 2: Diddy's Kong Quest, Donkey Kong Land 2, and Donkey Kong 64. The are the equivalent to Mine Carts from Donkey Kong Country and appear to be skull shaped.
In Donkey Kong Country 2: Diddy's Kong Quest and Donkey Kong Land 2, Mine Carts appear in Target Terror, Rickety Race, Krazy Koaster (DKL2), and Haunted Hall (DKC2). In Target Terror, Diddy and Dixie Kong have to jump from Skull Cart to Skull Cart to avoid falling into abysses. In Rickety Race, the Kongs have to defeat ten Krashes to gain a DK Coin. In Haunted Hall which exclusive to Donkey Kong Country 2: Diddy's Kong Quest, the Kongs had to avoid Kackles. In Krazy Koaster which is exclusive to Donkey Kong Land 2, the Kongs had to ride Skull Carts to go throughout the level.
In Donkey Kong 64, Skull Carts reappear and this time are not rode upon. They are exclusive in the area Creepy Castle. They appear to carry TNT Barrels and go at high speeds to try to crash into Donkey Kong to attack him so he can lose his coins. They also gain a different appearance, being more pointy than the two previous games.