The ornamental design for a fishingrod handle, as shown and described.
FIG. 1 is a perspective view of a fishing rod handle showing my new design;
FIG. 2 is a right side view thereof;
FIG. 3 is a left side view thereof; the left side being a mirror image of the right side;
FIG. 4 is a top view thereof;
FIG. 5 is a bottom view thereof;
FIG. 6 is a rear view thereof;
FIG. 7 is a front view thereof; and,
FIG. 8 is a right side view thereof with a reel and rod attached thereto for illustrative purposes only. The subject matter shown in broken lines, including the reel and rod, do not constitute any part of the claimed designs.