Does the Kuo-toa’s Sticky Shield reaction work on natural weapons?

As the title says, the Kuo-toa creature has a reaction that can catch weapons. I’m curious if it works on natural weapons like bites and punches. Here is the text in question.

Sticky Shield. When a creature misses the kuo-toa with a melee weapon attack, the kuo-toa uses its sticky shield to catch the weapon. The attacker must succeed on a DC 11 Strength saving throw, or the weapon becomes stuck to the kuo-toa’s shield. If the weapon’s wielder can’t or won’t let go of the weapon, the wielder is grappled while the weapon is stuck. While stuck, the weapon can’t be used. A creature can pull the weapon free by taking an action to make a DC 11 Strength check and succeeding.