@Mott-The-Hoople saidProbably not.
could bidens actions, pardons/clemency decisions be legally overturned?
https://www.foxnews.com/politics/biden-had-no-idea-he-signed-natural-gas-export-pause-johnson-says
He has the power to issue commutations and pardons. Whether he's mentally capable of making an appropriate decision doesn't matter as far as I know.