The ornamental design for the foldable dip net frame, as shown and described.
FIG. 1 is a perspective view of the foldable dip net frame showing the design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a rear elevational 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 present application claims the priority of Chinese Patent Application No. 2018306737561 filed Nov. 26, 2018, under 35 U.S.C. § 119, which is hereby incorporated by reference.