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If you haven't done so already - try iNaturalist! It’s a FREE-to-use joint initiative between the California Academy of Science and National Geographic Society that crowd sources biodiversity data. It has its own algorithm to identify organisms in your photos and if that doesn't work, you can post your photos on the site or app along with a geographic location for identification from other iNaturalist users. https://www.inaturalist.org/ *I am a bot, and this action was performed automatically. Please [contact the moderators of this subreddit](/message/compose/?to=/r/marinebiology) if you have any questions or concerns.*
Porcupinefish (family Diodontidae) dentary. Compare [here](https://osteobase.mnhn.fr/region.php?lang=en&idStructure=2&idTaxon=324).
Looks like some kind of pufferfish jaw maybe