Golden Frankie is an animatronic in the Five Nights at Freddy's series. He is a secret animatronic in the Five Nights at Frankie's series as Frankie's version of Golden Freddy.
Five Nights at Frankie's
Golden Frankie may randomly appear on the show stage where Frankie usually is and then when the player goes back to his room, Golden Frankie appears and kills you, but does not crash your game like Golden Freddy.
Five Nights at Frankie's 2
In this game, Golden Frankie has a 1% chance of appearing and crashing your game when you run out of power, instead of the normal Freddy and Frankie double song/jumpscaree.
Five Nights at Frankie's 3
In this game, Golden Frankie has a bigger role. He seems to be in someway connected to Freddy, because when Freddy almost kills you (but fails), Golden Frankie has a 10% chance of becoming active while all other animatronics (besides Freddy) are shutdown. This is his biggest role, and this means that Golden Frankie is in someway connected to Freddy.
Five Nights at Frankie's 4
In this game, he has a minor role, and is seen deactivated in the closet. Whenever you look at Golden Frankie, you hear Freddy's laugh. This suggests that Freddy had deactivated him after their connection in Five Nights at Frankie's 3 and is a nod to Freddy being the true main antagonist of the Five Nights at Frankie's series (due to tampering with all the new animatronics).