The ornamental design for a flyingdisc with insetoctopus form, as shown and described.
FIG. 1 is a front view of a flying disc with inset octopus form;
FIG. 2 is a rear thereof;
FIG. 3 is a left side view thereof;
FIG. 4 is a right view thereof;
FIG. 5 is a top view thereof;
FIG. 6 is a bottom view thereof; and,
FIG. 7 is a perspective view thereof.
The drawings are shaded to indicate contrasting surfaces. Portions of the disclosure shown in broken lines depict environment and forms no part of the claimed design.