Probably not. Panorama stitching software works by finding matching features in overlapping parts of adjacent images and using those matches to estimate how the views map together. It also assumes the photos were taken from roughly the same camera position.

In your case, the six views are already flattened into one JPG, and based on the description they do not appear to have enough natural overlap. If they were also taken from different positions, that makes stitching even less likely to work correctly.

Missing EXIF data by itself is usually not the main issue; the bigger problem is lack of usable overlap and consistent viewpoint. With only the combined JPG, software like PTGui or ICE has very little reliable information to reconstruct a correct panorama.

If you can get the original individual images, especially with overlap and shot from the same position, you’ll have a much better chance. Otherwise, you may be limited to manual editing rather than true panorama stitching.