Is any of Frankie group still alive?

Yes, there are still surviving members of Frankie's group known as "The Delfonics." As of my knowledge cutoff in September 2021, the following group members were still alive:

Randy Cain: Born on December 31, 1938, Randy is one of the founding members of The Delfonics. He continues to perform under the moniker "Delfonic's Randy Cain."

William Hart: Born on August 16, 1942, Willie was also a part of the original Delfonics lineup and remained an active member throughout their prime years.