Collage made from photographs, or parts of photographs, is called photomontage.
From the en.wikipedia.org
Giroux works in kinetic sculpture, digital photomontage and handmade objects.
From the dailyherald.com
It has also ghosted a good deal of her later photomontage and performance.
From the guardian.co.uk
For compositing in graphic design and still photography, see photomontage.
From the en.wikipedia.org
This innovation reads to me as an Internet Age version of photomontage.
From the huffingtonpost.com
Hockney created these photomontage works mostly between 1970 and 1986.
From the en.wikipedia.org
He even designed a photomontage birth announcement in 1930 for his recently born son, Jen.
From the en.wikipedia.org
But the communist artist John Heartfield embraced it, so pioneering photomontage in Germany.
From the morningstaronline.co.uk
The addition of text enabled photomontage to convey precise messages as succinctly as poetry.
From the morningstaronline.co.uk
More examples
A montage that uses photographic images
Photomontage is the process (and result) of making a composite photograph by cutting and joining a number of other photographs. The composite picture was sometimes photographed so that the final image is converted back into a seamless photographic print. ...
A composite image combining two or more photographs; The art of constructing such images
Photograph of an area with properly scaled images of windmills superimposed to show how they would look in a particular location.
While plans and drawings will provide accurate and detailed information about proposed schemes, there are occasions when high-quality visualisations can lift an idea off the page and bring a project to life.
A collage made up of photos, or parts of photos. These are often made digitally now.
(pronounced photo-montaj) - A two-dimensional combining of photographs or parts of photographs into an image on paper or other material (a technique much used by the Surrealists in the 1920s, such as Max Ernst)
A collage technique that uses parts of photographs. One artist known for this is David Hockney.
An art composition created by arranging multiple photographs into one; often, uses photographs that hold elements or represent a single theme that the artist is trying to express.