The ornamental design for an ice cream novelty bar, as shown and described.
FIG. 1 is a top plan view thereof showing my new design, the bottom plan view being identical thereto;
FIG. 2 is a rear elevational view thereof showing my new design;
FIG. 3 is a side elevational view thereof showing my new design, the elevational view of the opposite side being identical thereto showing my new design; and,
FIG. 4 is a front elevational view thereof showing my new design.