There are several ways to approach this.
Are all the images already placed?
If you resize the image frame is that a lot of work and shifiting images to get them back in place?
If you crop the photo in photoshop would it cause too many images to move out of place?
Would you prefer to just make the image background pure white and leave the image size the same so that it doesn't affect their placement in the layout?
Solutions would be:
Resize the image frame in InDesign to hide the white background,
or increase the size of the image so it fills the frame and the white background becomes hidden
Perhaps you could use the Object>Clipping Path and Detect edges to create a clipping path around the images so that the white background is hidden. (This is probably tricky)
Open all the images in Photoshop and:
Crop all the images, and then refit them in the layout in InDesign
or
Select the white background and erase it so it's pure white – this wouldn't affect the image layout in InDesign because all the images would remain the same size, just the colour around the image changes.