Here's how to find and use sound IDs for the Megaphone in Grow a Garden 2.
You can use any sound you want for an iPhone alarm, and here's how to set it up.
To use Separate App Sound on a Samsung Galaxy phone, go to Settings > Sounds and Vibration > Separate App Sound, toggle it on, choose the app (e.g., Spotify), and select the audio device (e.g., ...