Funko Five Nights At Freddy’s 18 Inch Rockstar Freddy Plush FNAF Pizza Simulator

It's a part of the Five Nights at Freddy's (FNAF) merchandise line which includes plushies based on characters from the game series. 

This specific plush represents Rockstar Freddy, recognizable by the purple top hat and bow tie, along with a yellow star on the chest. 

Funko produces various FNAF plushies, and this one is likely from the "Pizzeria Simulator" series.