There are ways to get a youtube video thumbnail. One method is to get it through a URL Modification.
The YouTube thumbnail image URLs are usually located at the following path:
“https://img.youtube.com/vi/” + {video_id} + “/maxresdefault.jpg”
where {video_id} is the unique identifier for a specific YouTube video.
Second method is to get it through external websites.
Like: youtube thumbnail grabber
Insert video url and your task is done!
Blog: Line How