Adam Clarke on Psalms 52:1

Why boastest thou thyself - It is thought that Doeg boasted of his loyalty to Saul in making the above discovery; but the information was aggravated by circumstances of falsehood that tended greatly to inflame and irritate the mind of Saul. Exaggeration and lying are common to all informers.

O mighty man? - This character scarcely comports with Doeg, who was only chief of the herdsmen of Saul, 1Sam 21:7; but I grant this is not decisive evidence that the Psalm may not have Doeg in view, for the chief herdsman may have been a man of credit and authority.