A caddie stationed ahead of the players — down at the landing area — to watch every ball land so nobody has to hunt for it. Forecaddies are as old as the game's records: an 1824 account recalls Edinburgh clubmaker Andrew Dickson performing "the duty of what is now commonly called a fore-cady" back in the 1680s, and the shout golfers used to warn them a ball was incoming is the likeliest origin of "Fore!" The role survives in two forms today: tournament spotters posted on blind holes, and the resort forecaddie who works ahead of a cart group, giving yardages, reads, and ball locations for all four players at once.
Source: https://www.scottishgolfhistory.org/origin-of-golf-terms/fore/ · high confidence