It sounds like you're looking for two different things:
There is a critical distinction between "free-to-play" games and "free" pirated games. It sounds like you're looking for two different
Sites offering "free Switch games for Android" are rife with: revisa permisos de apps
¿Qué hago si ya descargué un archivo sospechoso?
Ejecuta un antivirus (Malwarebytes, Kaspersky), revisa permisos de apps, y si ves algo extraño, restablece tu teléfono de fábrica. y si ves algo extraño
Even then, most AAA games run at 10–20 FPS with graphical artifacts. It’s an experimental hobby, not a practical way to play.