צָב Tzav
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.
Third of Vayikra's eight. Traditionally the dab-lizard or tortoise; the identification is discussed. The same lexicon entry carries the covered wagons of Bamidbar and Yeshayahu, so this row counts only the one verse of the creature.
וְזֶה לָכֶם הַטָּמֵא בַּשֶּׁרֶץ הַשֹּׁרֵץ עַל־הָאָרֶץ הַחֹלֶד וְהָעַכְבָּר וְהַצָּב לְמִינֵֽהוּ
And these are they which are unclean unto you among the swarming things that swarm upon the earth: the weasel, and the mouse, and the great lizard after its kinds,
Quick answers
What is the Hebrew word for tzav?
Tzav in Hebrew is צב, with a gematria of 92 in the standard method.
How many times is the tzav mentioned in the Tanakh?
The word stands 1 time as the creature, first at Leviticus 11:29.
A spelling is not a word. The bare letters צב 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 צב →