Looks like Red Rodney to me.
Lower face doesn't look like Red to me.
I agree with Chuck. I don't think it's Rodney.
The only Savoy date on which Trummy and Dexter appear together is the Elk's Auditorium live gig on July 6, 1947, originally issued on Bop (probably a Reig created label) and later issued on Savoy. Eliminating all the obvious names, other musicians on the date included Barney Kessel, Russ Freeman, Harry Babasin. I don't think it's any of them although I'm not ruling Freeman out. The only other names are the unknowns Leroy Gray and Ken Kennedy.
So that's what Teddy the Toad looked like....