No, Tittle never was a player/coach, altho' he mentored
some rookie/young QB's after he retired from playing.
The 'last' NFL player/coach is difficult to determine.
I'd nominate Tom Landry, who played in the mid-1950's
at Defensive Back for the NY F'ball Giants while also
doing the Defensive Co-ordinator duties.
During his tenure as Dallas Cowboys Head Coach, Landry
appointed Dan Reeves a player/Coach while Reeves still
had an active role at running back for the team.
Reeves was a player/coach for the Cowboys from 1969 to
the end of the 1972 season, when he retired from playing
to become a full time assistant coach, from which position
he became a head coach in his own right for Denver,
the NY F'ball Giants and the Atlanta Falcons.
There is of course the 'other' NFL Dan Reeves, who owned
the Cleveland Rams (sole owner in 1943) and who, after
playing the 1945 NFL championship game in icy Cleveland,
moved the team to southern California where they became
the Los Angeles Rams. This Dan Reeves passed away in
1971. He was never involved in coaching or in playing.