Trip

You cause an object--a length of vine, a stick, a pole, a rope, a carpet, a rock, or a similar object to rise off the ground or floor it is resting on to magically trip the moving target. The creature must succeed on a Dexterity saving throw or fall Prone. The object then returns to its original position.

The spell assumes such an object is available at least a couple of times during a combat encounter. The DM has latitude in ruling otherwise, depending on the environment.

Cantrip Upgrade. The target's possible size increases at 5th level (Large), 11th level (Huge), and 17th level (Gargantuan).

Homebrew spell