Who made forks?
According to the site The history of eating utensils, the forks were introduced by the Greeks, atleast to the western history of eating utensils. See,
These following books could give you more information:
Petroski, Henry. The Evolution of Useful Things. New York: Alfred A. Knopf, 1992.
Giblin, James Cross. From Hand to Mouth: Or, How We Invented Knives, Forks, Spoons, and Chopsticks & the Table Manners To Go With Them. New York: Harper Collins Publishers, 1987.