I made a Boss Baby mod once and it's kinda bad but you should play it anyway cuz it's funny baby lol
P.S. don't play at 3AM...
Downloads (file was too big to put here) -
Gamebanana Download - https://gamebanana.com/mods/327888
GameJolt Download - https://gamejolt.com/games/FNF-Vs-Boss-Baby/654138