Matt Nokes, ‘95. Hit the ground running w/DET in ‘87 with 32 HR and a T3 ROY finish. Never quite reached those heights again, though he did have a couple 20+-HR years with the Yankees.
He was still “only” 31 when he signed in Baltimore...you’d figure he could spell Chris Hoiles once, maybe twice a week and occasionally get some play at DH. Apparently it was an old, old 31, though. 54 at bats, 6 hits, and 2 HR later, he (and apparently his career) was dunzo.
Speaking of that ‘95 squad, one could probably make a case (such as it is) for Andy Van Slyke, as well.