A subreddit for finding (android) app names or any app names in general.

This comment was posted to reddit on Mar 07, 2015 at 9:24 am and was deleted within 12 hour(s) and 3 minutes.

You can try to reverse search that image. I did it and that image seems like a theme of GO Launcher. You can download it from a reliable source.

For the subreddit, you can ask about apps on /r/Android.