I claim the ornamental design for popping frog bait design, as shown and described.
FIG. 1 is a left side view of a popping frog bait design;
FIG. 2 is a top plan view thereof;
FIG. 3 is a right side view thereof;
FIG. 4 is a bottom plan view thereof;
FIG. 5 is a rear view thereof;
FIG. 6 is a front view thereof;
FIG. 7 is a front perspective view thereof; and,
FIG. 8 is a rear perspective view.
The broken lines in the drawings depict parts of the portion of popping frog bait design that are not part of the claim. The broken lines and the structures and features they depict form no part of the claimed design.