Friar Tuck was the name of a character in Human mythology who served as as a priest in Robin Hood's band of Merry Men in an area of England known as Sherwood Forest. According to legend, Friar Tuck was a former monk who was expelled from his order due to a lack of respect for authority and served Robin's band as chaplain.
In 2367, the entity known as Q transported the senior officers of the USS Enterprise-D into a recreation of Sherwood Forest and the story of Robin Hood in an attempt to teach Captain Picard a lesson about love. During the reenactment, each of the officers played the part of one of the Merry Men. The role of Friar Tuck was played by Lieutenant Commander Data. (TNG: "Qpid")