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So a repair guy said he needs to replace this on my Macbook Pro 2015 but he doesn’t know what it’s called, so I thought I could help him look for answers. Any ideas?

It’s a mosfet and you can find the exact item through looking at the schematics and board-view for the logic board’s board number. The board number is located usually near the edge of the board.

First is your system having a problem? If so, what are you encountering? If your system is working did you just pick it up from repair? It might be an extra part that snuck in. If you are having issues: You’ll need to pop the bottom cover and then compare your logic board and the IFIXIT board image here MacBook Pro 15" Retina (Mid 2015, Integrated Graphics) 2.8 GHz 16 GB RAM Logic Board take note on that your board is missing. Did you find the location of the chip? If not it then came from the back side follow this guide to take out the logic board MacBook Pro 15" Retina Display Mid 2015 Logic Board Replacement. It will take a rework station to re-attach the chip (if its still working) or you’ll need to find a replacement. Your images are not very clear so we can’t read the chips info reliably.