The ornamental design for a collapsibletoy, as shown and described.
FIG. 1 is a top perspective view of a collapsible toy showing our new design;
FIG. 2 is a bottom perspective view thereof;
FIG. 3 is a front view thereof;
FIG. 4 is a rear view thereof;
FIG. 5 is a right side view thereof;
FIG. 6 is left side view thereof;
FIG. 7 is a top view thereof; and,
FIG. 8 is a bottom view thereof.
The broken lines depict the portions of the collapsible toy that form no part of the claimed design. The unshaded areas within the broken lines likewise form no part of the claimed design.