I claim the ornamental design of a fishing rod grip handle, as shown and described.
FIG. 1 is a perspective view of a fishing rod grip handle, showing my new design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a bottom plan view thereof; and,
FIG. 4 is a top plan view thereof.
Rear, right side, and left side elevational views of the fishing rod grip handle are not shown as they are identical to the front elevational view shown in FIG. 2.
The broken lines in the drawing figures show unclaimed subject matter only and form no part of the claimed design.