The ornamental design for a penpuppet, as shown and described.
FIG. 1 is an environmental front view of the pen puppet showing my new design;
FIG. 2 is a front elevation view of the pen puppet;
FIG. 3 is a rear elevation view of the pen puppet;
FIG. 4 is a top view thereof;
FIG. 5 is a bottom view thereof;
FIG. 6 is a left side view thereof; and,
FIG. 7 is a right side view thereof.
The pen tip shown in FIG. 1, the inside shown in FIG. 5, and the face shown in FIGS. 1, 2, 6, and 7 are included for the purpose of illustrating features and portions of the pen puppet that form no part of the claimed design.