There isn[SQ]t a single, universally known Android app called "Video Thumbnail Downloader For YouTube." Many apps on the Google Play Store offer functionality to download YouTube thumbnails, but they often have different names. These apps typically work by :

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Allowing you to paste a YouTube video URL:

You copy the URL of the YouTube video and paste it into the app.
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Extracting the thumbnail:

The app then extracts the various available thumbnail resolutions (often low, medium, and high resolution) from the provided URL.
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Saving the thumbnail:

You can then choose which thumbnail to download and save to your Android device[SQ]s storage.

Important Considerations:

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Legality:

Downloading YouTube thumbnails might be acceptable under fair use in some circumstances, but downloading and re-using them commercially without permission could violate copyright laws. Always respect the copyright of the video creators.
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App Safety:

Be cautious when downloading apps from the Google Play Store. Check the app[SQ]s reviews and ratings carefully before installing it to avoid malware or apps that collect your personal data without your knowledge. Look for apps with a good reputation and a significant number of positive reviews.
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YouTube[SQ]s Terms of Service:

Remember that YouTube[SQ]s Terms of Service may prohibit downloading thumbnails or other content without authorization. Violating these terms could result in your account being suspended.


In short, you[SQ]ll need to search the Google Play Store for "YouTube thumbnail downloader" or similar terms. Carefully review the apps you find before installing one. Remember to always respect copyright laws and YouTube[SQ]s terms of service.