If you are referring to the protective glass between the lens and the outside world, you certainly can.[br]
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Here is one vendor selling it: https://www.ebay.com/itm/304140055710[br]
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Or shop around to somewhere else. They can be bought in many places.[br]
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When replacing this glass, use a heat gun, iOpener, hair dryer, or other source of heat to loosen the adhesive. Carefully remove all glass shards, use a pair of tweezers to get any glass shards out from the cracks. Turn the phone over (NOT over your face! Over a trash can only!) and gently shake it for a couple minutes at all angles to give any small glass shards that may have fallen a chance to fall back out, and blow compressed air into it to help any stuck glass on it's way.[br]
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Remove any adhesive residue by peeling as much off with your tweezers as you can, and remove the rest with a q-tip dipped in 90%+ isopropyl alcohol. Use a clean, dry, nothing on it q-tip to remove any dust from the camera lenses carefully as the last step before putting the new protective glass on.[br]
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If your actual camera lenses have been damaged, your camera module(s) will need to be replaced to restore image quality. There is no way to fix a damaged lens without very delicate and technical repairs, and it honestly is not worth it versus the cost of replacing the camera.[br]
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Good luck!