What zombie in the original game wears a snorkel and hides underwater?

What zombie in the original game wears a snorkel and hides underwater? It is the Snorkel Zombie.

Snorkel Zombie appears in the pool sections of the original Plants vs. Zombies. While walking through water, it submerges and advances beneath the surface, making it difficult for many straight-line attackers to hit. It rises when it reaches a plant, then pauses at the target to eat it, exposing itself to attacks.

This behavior makes the zombie more than a cosmetic swimmer. A player who relies only on pea shooters can find that shots pass harmlessly over the submerged zombie. Lobbed projectiles from plants such as Cabbage-pult and Kernel-pult can attack it while it is underwater, and defensive timing can exploit the moment when it surfaces to feed.

Dolphin Rider Zombie is an easy alternative to confuse with it because both are pool-stage enemies. Dolphin Rider carries a dolphin and can leap over a plant, whereas Snorkel Zombie has no dolphin and specializes in underwater concealment. Balloon Zombie floats above the lawn, and Zombie Yeti is a rare, separate enemy with a retreating behavior.