Chomper

The Chomper is a multi-use one-shot-kill plant. It appears to be loosely based on Audrey II, the carnivorous, man-eating plant from Little Shop of Horrors as shown in the Suburban Almanac.

Usage
The Chomper can eat any zombie other than a Gargantuar, Giga-Gargantuar or Dr. Zomboss in one bite - even Zombonis and bobsleds. It will spend about 40 seconds chewing its meal, during which time it is vulnerable and cannot eat another zombie.

If a Gargantuar is in front of it, and there are no other zombies that the Chomper can possibly eat (apart from the Gargantuar), and it is not currently chewing, it will bite away at the Gargantuar and do small amounts of damage until it gets squished.

Suburban Almanac Entry
Chomper

Chompers can devour a zombie whole, but they are vulnerable while chewing.

Damage: massive

Range: very short

Special: long delay between chomps

Chomper almost got a gig doing stunts for The Little Shop of Horrors but it fell through when his agent demanded too much on the front end. Chomper's not resentful, though. He says it's just part of the business.

Cost: 150

Recharge: fast

Standard Levels
The Chomper has a range of two squares in front of it, so it can eat a zombie on the other side of a Wall-nut, Tall-nut, or Pumpkin. Like all high-damage plants, it's best against tough zombies, or for when a zombie manages to get past your defenses. The Tree of Wisdom mentions that the Chomper and Wall-Nut were friends in college owing to the way that if Pogo or Pole-vaulting zombies would jump over the Wall-Nut, it would fall into the waiting mouth of the Chomper.

Zomboogie (I, Zombie level)
Dancing Zombies are the most effective against the Chomper because they can continue to summon Backup Dancers. Just be sure to place the Dancing Zombie on the far right so that he will start summoning his Backup dancers before he gets to the first row of plants, and to use a regular zombie first if there is a Chomper in the first column. When all else fails, use the regular Zombie to feed the Chomper, then eat it with another zombie.

All your brainz r belong to us (I, Zombie level)
There's no time limit on these puzzles, so plan your first moves carefully. There's usually only one lane with Chompers, so that's generally a good candidate for a Digger Zombie (remember - Chompers can't chomp behind themselves), but remember that there is almost always a Magnet-shroom close enough to steal the Digger Zombie's pick, so you may have to wait until you've earned enough Sun to afford a Bungee Zombie to get rid of the Magnet-shroom before you can send a Digger after the Chompers. Also, be warned: if a Chomper is in the leftmost column, it can eat any Digger Zombies that try to eat it.

Level 5-5 (Roof)
On Level 5-5 on the Roof, the Chomper is your only offensive plant here, but you also get Pumpkins, Cherry Bombs, and Flower Pots. It is best to put all of your frontwards Chompers in Pumpkins.

Trivia

 * No matter what type of zombie a Chomper eats, the arm hanging out of its mouth is that of a regular Zombie.
 * The Chomper on the start-up screen for Plants vs. Zombies doesn't have spikes on the back of its head. The Chomper has saliva coming out, implying it is hungry.
 * According to the Tree of Wisdom, the Chomper and the Wall-nut were roommates in college, which is supposedly why they work well together.
 * The Chomper could be based off of the Piranha Plant in the Mario series or the Venus Fly Trap in the Crash Bandicoot series.
 * The Chomper is the only plant without eyes.
 * Chompers can't eat Gargantuars whole, but bite them instead and deal little damage. However, if a Chomper kills a Gargantuar, the Gargantuar will fall down as normal but the Chomper starts chewing with an arm hanging out of its mouth.
 * It is unknown how a Chomper can tell if a zombie is in front of it. (although it could easily be from vibrations in the ground and guess work.)
 * When an Imitater Chomper is eating a zombie, no matter what type of zombie an Imitater Chomper eats, the arm hanging out of its mouth is that of a regular Zombie, but it's black and white.
 * If a Chomper is planted directly in front of a bobsled, it will eat the sled, and all four zombies in it, which can be extremely helpful in Bobsled Bonanza.
 * On the Plants vs. Zombies website, it says that the Chomper costs 175 sun, while it really only costs 150.