I've come across a sheet of multiple individual photos, I'm guessing they are something to do with a video editing as they are of Bob Marley at a kids birthday party which I remember having happened. Can anyone tell me what the sheet of photos are called as I would really like to research them but I just come across a blank.
It sounds to me that what you are describing is what we call a contact sheet or a proof sheet. It's called that because in the film days, it was made by physically placing the negatives on the print paper (in contact with it, that is) rather than projecting through an enlarger. These contact sheets were used to select which pictures on a roll of film merited further work, without wasting time and materials.
The example you have might be from a video, but it might also be from a series of pictures taken in quick sequence, perhaps using a motor drive. Searching for "bob marley contact sheet" turns up a number of examples from photographers Allan Ballard, David Burnett, Richard Aaron, and others. For example:
While we don't make them this way in the digital realm, the terminology lives on — you'll find "contact sheet" options in Lightroom and other software.