Launch the Hidden Apps Detector and let it scan if any installed app disguised without an icon. Because it can be dangerous and display them for you to choose the action to perform.
This application has been scanned for viruses and it has been found totally secure. Kingdev17 is the official developer of the app which can be found in the Tools category. The latest update was on Oct 3, 2019 and Hidden Apps Detector was downloaded and set up by over 0,5M users.
Users rated this application 3.8 on Google Play. The app shows adverts. A free .apk installation package of Hidden Apps Detector 1.0.5 can be downloaded from Droid Informer and you can have a look at users' reviews on this site. Prepare 4 MB of free space on your device for this app setup package and keep in mind that it works fine on Android 5.0 and above.
Users write reviews pointing out that the main drawback of the app is annoying ads.