Zomanha

The Zomanha is a Zombie Piranha, which moves quickly and can only be attacked by lobbed-shots or other plants that hit Snorkel Zombies, but it has low health. It doesn't target the house, but will instead target random plants, jumping out of the water and swallowing every plant on that space in one bite. However, when it jumps out of the water, all attacks can hit it for a couple of seconds.

Stats
Most of this is covered in the infobox.

Health: 5nds.

Speed: Rapid.

Attack Strength: Infinite.

Special: Targets and insta-kills plants, but is more vulnerable to plants when it attacks.

Introduced in: Misty Pond Night 13.

Strategies
Using catapults of any kind will prove an effective strategy, as long as it doesn't change rows to avoid the attacks. Melons are extremely effective due to their splash damage making them near-undodgable, or you can just use instant-kill plants.

Another strategy would be to plant a Lily Pad or Sea-shroom somewhere in front of the rest of your plants. Zomanhas tend to target the nearest plants first, and so it will likely attack the Lily Pad that you used as cannon fodder, exposing it to attacks from the rest of your plants for a couple of seconds.