Stone Axe	Throw it using . You can throw them so long as you have the item equipped.
Skateboard	Ride it to increase your speed.
Fruit	Partially restores your vitality.
Meat	Completely restores your vitality.
Milk	Completely restores your vitality.
Spade	Ride the Red Camptosaurus dinosaur.
Heart	Ride the Blue Camptosaurus dinosaur.
Diamond	Ride the Elasmosaurus dinosaur.
Club	Ride the Pteranodon dinosaur.
Honey Girl	Become invincible for a short time.
Eggplant	Your vitality decreases faster for a short time.
Key	Unlocks a hidden bonus.

Note: There are more items in addition to these.