Moses uses these questions to express his doubt that there could be enough meat to feed all of the people. Alternate translation: "We would have to kill entire flocks and herds and catch all the fish in the sea to satisfy them!" (See: [[rc://en/ta/man/jit/figs-rquestion]])
The word "all" is an exaggeration to show how impossible it was to provide food for all the people of Israel. (See: [[rc://en/ta/man/jit/figs-hyperbole]])