As an example, is there an easy way to crop away the o's in the Google logo using Gimp?
The result should then be "Ggle" with a smaller image width than the original because the o's are missing.
It's easiest to copy the elements you want to keep to new layers, then align them and crop.
If you really want to try and do a 'reverse crop', I'd recommend using the
Layer > Liquid Rescale feature. Add a
Feature Discard Mask around the elements you wish to disappear, then rescale until they are gone.