Exclusive to: 
“This will fit into a cannon perfectly.”
“Okay, but I still think fireballs would be better.”
“Do not worry, Wolfgang will carry.”
“I must carry this weight... to the cannon, at least.”
“AMMUNITION ACQUIRED”
“A suitable projectile for a cannon.”
“I sure wouldn't want one of these fired at my boat.”
“That looks heavy. Someone should load it into the cannon.”
“Woe to any fool who doth attack my ship!”
“Mr. Wolfgang says to lift with your legs, and we've got lots!”
“I hope it won't be needed.”
“Rock big, good for go boom”
“Better load this in the cannon.”
“Oh what a sinking feeling it brings!”
“Thought we not allowed to throw rocks?”
–Wurt
“That goes in the cannon.”
“Pretty self-explanitory, really.”
The Cannonball is a item exclusive to Don't Starve Together, introduced in The Curse of Moon Quay update. It's crafted in the Seafaring Filter from two Cut Stone and one Gunpowder. Cannonballs can be loaded into a Cannon mounted on a Boat or Dock. A loaded Cannon deals 200 (120 area of effect) damage and can uproot Kelp and kill Ocean Fish, as well as defend against Pirate Raids.
The Cannonball crafting recipe can be obtained from a Blueprint given by the Queen of Moon Quay in exchange for Bananas if the player does not have any Accursed Trinkets.
Gallery
Cannonball texture that was found in the Don't Starve: Newhome beta files.
Cannonball texture that was found in the Don't Starve: Newhome beta files in air
Cannonball texture that was found in the Don't Starve: Newhome beta files flies
Cannonball texture that was found in the Don't Starve: Newhome beta files splash
Cannonball texture from The Curse of Moon Quay beta
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