No. A U.S. president can grant pardons only for federal offenses — “Offenses against the United States” under Article II of the Constitution. The Justice Department’s Office of the Pardon Attorney states plainly that the president does not have authority to grant clemency for a state conviction or state criminal charge.
Lindsay Clancy faces Massachusetts state first-degree murder charges after a mistrial; those are not federal crimes. Any state-level pardon power in Massachusetts rests with the governor (with the Governor’s Council), not the White House, and typically applies after a conviction.