What is a type of chocolate confection known as truffles but the natural truffle still popular part French and some Italian cooking is?

You're mixing up two very different things!

* Chocolate truffles are a type of confectionery made from a mixture of chocolate, butter, cream, and sometimes other ingredients like liqueur or nuts. They are usually rolled into balls and coated in cocoa powder, chopped nuts, or other toppings.

* Truffles (the kind found in the ground) are a type of fungus prized for their intense earthy flavor and aroma. They are a delicacy often used in French and Italian cooking.

While both are called "truffles," they have nothing in common except for their round shape.