The ornamental design for rocking tiger, as shown and described.
The claimed rocking tiger is used for rocking (like rocking horses).
FIG. 1 is a perspective view of the rocking tiger showing my new design;
FIG. 2 is a right side elevational view thereof;
FIG. 3 is a left side elevational view thereof;
FIG. 4 is a bottom view thereof;
FIG. 5 is a front elevational view thereof;
FIG. 6 is a rear elevational view thereof; and,
FIG. 7 is a top plan view thereof.
The broken line showing of the figure's ears is included for the purpose of illustrating a portion of the rocking tiger and forms no part of the claimed design.