Sangrom was a male Starfleet chief petty officer who was assigned to the engineering in 2293. (Star Trek VI: The Undiscovered Country)
Sangrom's uniform including a name tag was auctioned off at the It's A Wrap! sale and auction on eBay. [1](X)
He was played by one of several unknown actors who served aboard either the USS Enterprise-A or USS Excelsior.