The ornamental design for a combination shellfish and nutcracker with integrated pick, as shown and described.
FIG. 1 is a left perspective view thereof; and
FIG. 2 is a front view thereof; and
FIG. 3 is a left side view thereof; and
FIG. 4 is a rear view thereof; and,
FIG. 5 is a right side view thereof.
The broken line drawings in FIG. 4 and FIG. 5 showing of parts of the design are included for illustrative purposes only and form no part of the claimed design.