The ornamental design for a cat-shaped child's trolley toy, as shown and described.
FIG. 1 is a side elevational view of the design;
FIG. 2 is a real lateral view of the design;
FIG. 3 is a front lateral view of the design; and,
FIG. 4 is a side view of the design.
The design disclosed and claimed herein, and illustrated in the above described figures, is not intended to include the leash depicted in said figures.