What is claimed is the ornamental design for a foam panel, substantially as shown and described.
FIG. 1 is a top, perspective view of the foam panel, showing my new design;
FIG. 2 is a front elevation view thereof;
FIG. 3 is a top view thereof;
FIG. 4 is a bottom view thereof; and,
FIG. 5 is a side elevation view thereof.
A description of the appearance of the article is as follows: A foam panel. Any broken lines showing portions of the design in the figures are included for the purpose of illustrating environment and unclaimed features and forms not part of the claimed design.