The ornamental design for a fishingrodholder, as shown and described.
FIG. 1 is a perspective view of a fishing rod holder, showing my new design;
FIG. 2 is a front view of the fishing rod holder;
FIG. 3 is a rear view of the fishing rod holder;
FIG. 4 is a left side view of the fishing rod holder;
FIG. 5 is a right side view of the fishing rod holder;
FIG. 6 is a top view of the fishing rod holder;
FIG. 7 is a bottom view of the fishing rod holder; and,
FIG. 8 is a view of a fishing rod held in the fishing rod holder.
The broken line showing of structural features is included for the purpose of illustrating non-claim subject matter and forms no part of the claimed design.