As nouns the difference between harrow and clods
is that
harrow is a device consisting of a heavy framework having several disks or teeth in a row, which is dragged across ploughed land to smooth or break up the soil, to remove weeds or cover seeds; a harrow plow while
clods is .
As a verb harrow
is to drag a harrow over; to break up with a harrow.
As an interjection harrow
is (obsolete) a call for help, or of distress, alarm etc.