The ornamental design for a frontgrill for an automobile, as shown and described.
FIG. 1 is a front perspective view of a front grill for an automobile of our new design;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a top plan view thereof;
FIG. 5 is a bottom plan view thereof;
FIG. 6 is a left-side view thereof; and,
FIG. 7 is a right-side view thereof.
A second embodiment of the design is the design of FIGS. 1–7, without the rear view of FIG. 3. Thus, the second embodiment of the design is depicted in FIGS. 1, 2, and 4–7.