Sharpened is a verb not a noun
sharped, sharpened
190mm
F sharp
A compass, a divider, or a sharpened pencil.
axes, sharpened sticks, arrows
Sharpened stones are typically associated with the Stone Age era, also known as the Paleolithic period. This era lasted from around 2.5 million years ago to about 10,000 years ago, and it is characterized by the use of basic stone tools, such as sharpened stones, by early human populations.
axes, sharpened sticks, arrows
Cavemen made stone weapons such as crude spears which were probably a sharpened stone tied on a long stick.
so they first found a rock then they sharpened so they can use it for hunting
That means a sharpened knife. The knife has been applied to a whet stone and is nice and sharp.
They sharpened stones by rubbing them on other stones.
sharpened
The first humans crafted tools and weapons from animal bones and rock sharpened against stone to hunt.
People in the Stone Age used sharpened sticks as hunting tools and weapons because they were effective for stabbing and throwing at prey. They were readily available and easy to craft from natural materials, making them a practical choice for survival in that era.
The materials are actually pretty much the same even if you are using an electric grinder. The knife is sharpened by using consistent strokes across a stone such as an oil stone, water stone, or diamond stone, etc.
Your canine teeth can be sharpened by going to your dentist, where he/she will probably add a contour in place, but if you mean 'sharpened' like a pencil sharpened, then talk to your dentist about that.