The ornamental design for a swimmingtoy for pool, as shown and described.
FIG. 1 is a perspective view of a swimming toy for pool, showing my new design;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a left side view thereof;
FIG. 5 is a right side view thereof;
FIG. 6 is a top plan view thereof; and,
FIG. 7 is a bottom plan view thereof.
The broken line showing of the swimming toy for pool is for the purpose of illustrating portions of the article that forms no part of the claimed design.