Darts are counted as stubble - The word rendered “darts” (תותח tôthâch) occurs nowhere else in the Scriptures. It is from יתח, obsolete root, “to beat with a club.” The word here probably means clubs. Darts and spears are mentioned before, and the object seems to be to enumerate all the usual, instruments of attack. The singular is used here with a plural verb in a collective sense.
Related Commentaries of Job 41:29
Job 41:29
29 Darts are counted as stubble: he laugheth at the shaking of a spear.