Which Kirby game introduced the 'Mouthful Mode' mechanic?

Kirby and the Forgotten Land introduced the Mouthful Mode mechanic. The system lets Kirby swallow and control large objects that are far too big to become ordinary copy abilities.

Mouthful Mode is a major part of the game's move into three-dimensional platforming. Kirby can wrap himself around objects such as cars, vending machines, traffic cones, lockers, and pipes, then use their shapes to drive, launch, inhale, or smash through obstacles. Car-Mouth Kirby, often nicknamed Carby, became the mechanic's best-known example.

Mouthful Mode is distinct from Kirby's traditional copy abilities, which are usually gained by inhaling particular enemies. The game did introduce new copy abilities too, including Drill and Ranger, but those are separate systems. Kirby's Return to Dream Land, Kirby's Epic Yarn, and Kirby Star Allies do not introduce this named mechanic.