Is it possible to tilt a propeller for attitude control, similarly to jet thrust vectoring?
Yes, on airships.

The Zeppelin NT can rotate its two forward and one rear propellers to create lift instead of thrust, a capability of particular value when the airship descends in an atmosphere with a strong temperature gradient. From this page about the Zeppelin NT:


  The two forward propellors swivel to 120° and the aft one to 90°, and
  a fixed aft lateral propeller give a high level of manoeuverability,
  and enable smooth, quiet flight and impressive fuel economy. Some of
  the unique flight characteristics come from the swivelling propellers,
  like vertical take offs, precise landings, hovering over exact
  locations, turns on its axis and flying backwards.




Tail propellers of the Zeppelin NT Airship. While the sideways mounted propeller is fixed, the rear propeller can swivel through 90° (picture source)



Front view of the Zeppelin NT with the forward propellers tilted up (picture source)

Another example would be the V-22 Osprey, obviously, but you might prefer to call those whirly things rotors, not propellers.