Both prophecies in Revelation and Joel
refer to locust-like creatures.

The Fifth Trumpet has demon-locusts
coming out of the Bottomless Pit. They
are similar to locusts but they are not
literal locusts. "And there came out of
the smoke, locusts upon the earth; and
unto them was given power, as scorp-
ions of the earth had power."
Revelation 9:3

The prophecy of Joel 2 tells of an army
of creatures which came upon the land
that act like locusts, but they are not
literal locusts.