Which is the term used for “a worker who is especially skilled at crafting items by hand”?

The term used for 'a worker who is especially skilled at crafting items by hand' is 'artisan'.

Explanation:

An artisan is one who has fine skills of crafting and modifying new things out of given raw material. A cobbler is an artisan who has the skill of turning a sheet of leather into a nice pair of shoes. A blacksmith bears the skills of shaping raw iron into articles of decoration. A potter has the required skills to turn a ball of clay into a fine pot. All these are examples of artisans who use their hands to shape one thing into other.