Isn't there a reference to 'Admiral' Chekov somewhere in TNG or DS9?
On screen? No. Though there was a Chekov episode in development for TNG
's seventh season.
There are a number of novels that refer to an Admiral Chekov -- Federation
, The Return
, the Vulcan's Soul
trilogy (where he actually appears).
Peter David's The Captain's Daughter
has Harriman taunting Chekov because he won't make captain.