Baked polenta fries (or polenta croutons) - A pinner says, "SOOOOO Tasty! Next time, instead of water - Use Vegetable Broth. My 1 year old adores these!" - (also other ideas on what to do with polenta.
Replace the Panko crumbs with a gluten-free equivalent. Whole Foods carries one by Kinnikinnick Foods. I think doing this one thing will make these gluten free as long as the polenta roll you use is also gluten free (many are!