Is there anything I can use to remove gorilla glue from hardwood?
I would first try a plastic scraping tool to see if you can physically remove it.

This page, under the FAQ tab from the Gorilla Glue site states:


  Wipe off excess glue immediately with a dry cloth or standard paint thinner. Do not drag glue over material, instead make small swipes to remove wet adhesive. Make sure you avoid skin contact. Cured glue can be removed with a chisel, scraper or sandpaper.


I'm not positive if a solvent would work, but before you try a solvent, test it on an inconspicuous spot of your floor to ensure it doesn't damage the wood finish.  Try denatured alcohol, mineral spirits, lacquer thinner, etc.