Toy Freddy is a major, but optional boss in Five Nights at Fuckboy's' normal scenario, and a party member in the Q scenario. His conditions for appearing are different for each night and scenario. He does not appear in the W Scenario. In all scenarios he appears in, he appears on the Show Stage. He needs to be beaten, along with Toy Bonnie, Toy Chica, Mangle and the Puppet to unlock the true final boss fight.
In Night X, you unlock him by having Freddy reach Level 20. In Night XX, he is unlocked by getting Freddy to Level 10 and beating 5 Cameras, and in Night XXX, he is unlocked by beating all 10 Cameras. He is a very hard boss who can use most of Freddy's skills. If you manage to beat him, you'll unlock Fazbear Combo.
He is unlocked by beating 2 cameras, where he will then appear in the Show Stage.