1) Collage 2) Montage 
Photomontage is the process and the result of making a composite photograph by cutting and joining two or more photographs into an illusion of an unreal subject. Sometimes the resulting composite image is photographed so that a final image may appear as a seamless photographic print. A similar method, although one that does not use film, is realiz...
composite photographic image made either by pasting together individual prints or parts of prints, by successively exposing individual images onto a ... [4 related articles]
A photographic composition assembled from pieces of different photographs or of different negatives, closely arranged or superimposed upon each other. Sometimes graphic material is added to the combination
A pictorial composition made by covering sheet of paper or card with overlapping photographs or fragments of photographs.
A photographic composition assembled from pieces of different photographs or of different negatives, closely arranged or superimposed upon each other. Sometimes graphic material is added to the combination. 
[n] - a montage that uses photographic images
a collage made up of fragments of photographs, newsprint, and other items; a photograph in which prints in whole or part are combined to form a new image.
noun a montage that uses photographic images