Fake Shemp or simply, "Shemp," is the term for someone who appears in a film under heavy make-up, filmed from the back, or perhaps only showing an arm or a foot.
Fake Shemp or simply, "Shemp," is the term for someone who appears in a film as a replacement for another actor or person. Their appearance is disguised using methods such as heavy make-up, filming from the back, or perhaps only showing an arm or a foot.