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Fake Shemp is the closest we have
Hm, so I wonder if there are enough films (or other media) for this sort of thing to be a trope of its own....
It would be a Trivia trope, because the average viewer won't necessarily know about the footage or sound usage, I think.
I believe I saw a trope for dead actors appearing in advertisements, which has also been done. ETA: It is called The Dead Rise to Advertise.
Edited by PCD
Perhaps one of the most prominent (and extreme) examples of this is Trail of the Pink Panther, starring Peter Sellers. As Sellers died over a year before production began, all footage of him in the movie is recycled footage from previous movies or unused/deleted scenes. A more recent example would be Star Wars: The Rise of Skywalker, which gave Carrie Fisher a prominent role through previously deleted scene from other movies despite her death two years before the movie's release. It was also done with Don Rickles in Toy Story 4 - he died before recording any new audio, but his character was given a role through archived recordings of his voice work. Is there a trope for this? If so, what is it called?