Nintendo has never released its operating system (Horizon OS) for phones or tablets. The Switch runs on completely different hardware (NVIDIA Tegra X1) and software architecture. An APK file is designed for devices. Nintendo does not make an Android launcher or system UI.

: Another legacy option is the NS Launcher by Mike Digicrafts , which allows you to organize your mobile apps just like a Switch library [0.5.2). 2. The Official Nintendo Switch Online App

You should always prioritize the official Google Play Store link for safety.