The ornamental design for the quilted hammock, as shown and described.
FIG. 1 is a front, top and right side perspective view of the quilted hammock, showing the new design;
FIG. 2 is a top plan view of the quilted hammock of FIG. 1;
FIG. 3 is a front elevation view thereof;
FIG. 4 is a rear elevation view thereof;
FIG. 5 is a left elevation view thereof;
FIG. 6 is a right elevation view thereof; and,
FIG. 7 is a bottom plan view thereof.
The quilted hammock is shown with symbolic cut lines in the drawing figures. These lines, and the appearance of the article between these lines, form no part of the claimed design.