I understand you're looking for on Android. However, I need to give you an important heads-up:
The official FNaF 4 mobile version includes the Halloween content (Nightmare BB, Mangle, Jack-O-Bonnie, Jack-O-Chica) as an in-app purchase or part of the base game in some updates — but not as a separate APK. Fnaf 4 Halloween Edition Apk Free Download Android