The ornamental design for a cloverleaf coffee table, as shown and described.
FIG. 1 is a perspective view of a cloverleaf coffee table showing my new design;
FIG. 2 is a front elevational view thereof, with the right-side, left-side and rear elevational views thereof being identical to FIG. 2.
FIG. 3 is a top plan view thereof; and,
FIG. 4 is a bottom plan view thereof.
The broken lines shown in the drawings of the figures are for illustrative purposes only and form no part of the claimed cloverleaf coffee table design.