Adam Clarke on Nahum 3:15

Make thyself many as the cankerworm - On the locusts, and their operations in their various states, see the notes on Joel 2 (note). The multitudes, successive swarms, and devastation occasioned by locusts, is one of the most expressive similes that could be used to point out the successive armies and all-destroying influences of the enemies of Nineveh. The account of these destroyers from Dr. Shaw, inserted Joel 2, will fully illustrate the verses where allusion is made to locusts.