Yes. Free options exist for automatically splitting one scan into multiple photos.

If the photo positions are consistent and you already know the crop boundaries, ImageMagick can batch-crop the scan using fixed crop coordinates. That works well when every scan uses the same layout.

If the boundaries vary, a better fit is an auto-detection tool such as Fred Weinhaus’s multicrop script (built around ImageMagick). It can detect separate items and handle different sizes and even some rotation.

For GIMP, the “Divide Scanned Images” script is another option. It provides a simple interface, supports batch processing, and worked well for at least one user, though you may need to tweak settings like abort limits or background sampling for reliable results.

So, for a free solution:

• use ImageMagick for predictable, fixed layouts
• use multicrop or GIMP’s Divide Scanned Images when you want automatic separation