A device that spawns Bottrocks, Poopsies or Obsidian Samsmite. A good move is to destroy this first before dealing with the other enemies.
Killer Fish
A Killer Fish swimming under the deck of Jim Dandy. Thanks to its sharp fangs, it is capable of tearing apart smaller fish (like Chuckleberry Finn). It is deadly fast when it attacks. There is no way to escape it, so it is recommended to avoid it.
Mine
A few of them float under the Jim Dandy deck. Touching them causes an explosion. Avoiding them is recommended.
Poopsie's Cocoon
This is not a real opponent. A slimy cocoon floating in a green goo. After destroying the incubator, a Poopsie will hatch from the cocoon.
Internal Organ
Some kind of internal organ that shoots green acid. It is indestructible.
Stomach Acid
Acid in the form of a little monster's head. You can't kill it, so it's best to avoid it.