The ornamental design for a puppet double balljoint, as shown and described.
FIG. 1 is a perspective view showing the front, top, and left sides of the puppet double ball joint;
FIG. 2 is a perspective view showing the front, bottom, and left sides of the puppet double ball joint;
FIG. 3 is a front elevation view of the puppet double ball joint, wherein the rear elevation view, the left side elevation view, and the right side elevation view are each a mirror image thereof;
FIG. 4 is a top plan view of the puppet double ball joint; and,
FIG. 5 is a bottom plan view of the puppet double ball joint.