There is a Batch Image Manipulation Plugin (BIMP) for GIMP which could be used to make crops to every image in a folder. However, it has limitations on positioning of the crop, e.g. centre, top left, bottom right, etc. [You can find it here](https://github.com/alessandrofrancesconi/gimp-plugin-bimp/releases/tag/v2.0). I have no link or affiliation with the developer, and I don't know how to install it on Linux, although I found a [link here](https://www.fosslinux.com/1207/bimp-adds-batch-processing-of-images-power-to-gimp.htm) which might be useful.

If you need to set a custom positioned crop, then perhaps have a look at using ImageMagick (which is free). There's a [tutorial on batch cropping here](https://deparkes.co.uk/2015/04/30/batch-crop-images-with-imagemagick/). I have no link or affiliation with that website.

In case of link rot, the example ImageMagick command given in that tutorial is

    mogrify -crop 300x300+150+150 -path ./cropped *.png

This would crop all PNG images contained in a folder to x=300px by y=300px at position x=150px, y=150px and save the results in a folder named "cropped".