Frederick La Rouque was a Human professional card shark from New Orleans who lived during the latter half of the 19th century. His parents were from the French region of Burgundy, so he spoke French fluently.
His profession took him to San Francisco in 1893, where he met an interesting gentleman from France named Data. Pegging Data for an easy mark, La Rouque was cleaned out by him in the game of poker. Data returned to his room wearing La Rocque's vest and Joe Falling Hawk's bowler hat. (TNG: "Time's Arrow")