They sure can, and no problems generally result. You can even go further than just rounding edges if you want, just don't cut into any area that supports the slide rails.
Attached is a pic of my Glock 23 with substantial frame mods, including a grip reduction.


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Thanks gentlemen! I'm now more confident about purchasing a G26 and making it fit my hand better. The information and encouragement I've seen on this forum is indescribable. Thanks again!

