I claim the ornamental design for toilet paper roll holder, as shown and described.
FIG. 1 is a perspective view of a toilet paper roll holder showing my new
design. FIG. 2 is a front elevational view thereof; FIG. 3 is a rear
elevational view thereof; FIG. 4 is a right elevational view therepf; FIG.
5 is a left elevational view therepf; FIG. 6 is a top plan view thereof;
and, FIG. 7 is a bottom plan view thereof.