While you may find "PPSSPP ISO" files online labeled as Forza Horizon 5, these are typically of older PSP racing games, such as Gran Turismo or Test Drive Unlimited , which have been re-skinned with textures and UI to resemble Forza. These files carry significant risks, including:
"Experience High-Speed Racing on-the-go: Forza Horizon 5 PPSSPP ISO Download for Android Mobile" forza horizon 5 ppsspp iso download android mobile link
This is the to play FH5 on Android.