What is claimed is the ornamental design for a mascot towel, as shown and described.
FIG. 1 is a perspective view of a mascot towel, showing the new design;
FIG. 2 is a front elevational view thereof, the rear elevational view being a mirror image thereof;
FIG. 3 is a left-side elevational view thereof;
FIG. 4 is a right-side elevational view thereof;
FIG. 5 is a top plan view thereof; and,
FIG. 6 is a bottom plan view thereof.
The broken lines showing a tag in the figures and text in FIGS. 1 and 5 are environmental features, and form no part of the claimed design. The remaining broken lines represent stitching and are part of the claimed design.