Dolphin Rider Zombie

Not to be confused with Dolphin, an enemy summoned by the River Beast.

is the aquatic equivalent of Pole Vaulting Zombie, but with faster speed.

Plants vs. Zombies:The Fall of The World
The speed is slightly faster than in PvZ1.

Almanac:

The dolphin is plastic.

Trivia

 * The almanac entry in this game contradicts the entry in PvZ1, which states that the dolphin is a zombie.
 * It might be because this is seven years after the events in PvZ1 and Dr. Zomboss replaced dolphin zombies into plastic dolphins.