צִלְצַל Whirring locust (tzelatzal)
Every verse in which this word stands as the creature — 1 place, in canonical order, first appearance to last. The word's lexicon entry carries more than the creature, so these are the creature's own verses — the row's note says what the other places are.
In Devarim 28:42 the tzelatzal inherits the trees and the fruit of the ground — the whirring creature of the curse, traditionally a locust. The same lexicon entry carries the cymbals of the Psalms and the harpoon of Iyov, so this row counts only the verse of the creature; the identification is discussed.
כָּל־עֵצְךָ וּפְרִי אַדְמָתֶךָ יְיָרֵשׁ הַצְּלָצַֽל
All thy trees and the fruit of thy land shall the locust possess.
Quick answers
What is the Hebrew word for whirring locust?
Whirring locust in Hebrew is צלצל, with a gematria of 240 in the standard method.
How many times is the whirring locust mentioned in the Tanakh?
The word stands 1 time as the creature, first at Deuteronomy 28:42.
A spelling is not a word. The bare letters צלצל stand 1 time in the corpus, which is a different question and often a different number: the same letters can spell a name or another word entirely, and the creature written with a particle attached is a spelling that search never returns. It is here, as itself.
See the one occurrence of the spelling צלצל →