Pretty sure that's just "bony claws" with the bone colour set to blue. It's available. In fact I'm pretty sure the only thing on him you can't replicate is that tail.
...Can we please have a scaled-up version for our Gorn?
In the foundry he is called alien gen male. So he is just a custom alien with a tail. You can customize him in the foundry. I have used him to put tails on gorn, but he is an npc and that is all he is.
Play more STO Foundry! (You can thank me later.)
A TIME TO SEARCH: ENTER MY FOUNDRY MISSION at the RISA SYSTEM in the SIRIUS SECTOR