The ornamental design for a childtricycle, as shown and described.
FIG. 1 is a front and left perspective view of a child tricycle showing my new design as assembled with auxiliary handlebars, seat, pedals, wheels, and tires in broken lines;
FIG. 2 is a front and left side perspective view of the child tricycle frame portion;
FIG. 3 is a right side elevational view thereof;
FIG. 4 is a top plan view thereof;
FIG. 5 is a bottom plan view thereof;
FIG. 6 is a front elevation view thereof;
FIG. 7 is a rear elevational view thereof; and,
FIG. 8 is a front and left side perspective view of the child tricycle in FIG. 1 with the addition of a parent handle and basket in broken lines.
The broken lines in the drawings illustrate portions of the child tricycle that form no part of the claimed design.