Is TONKS a Wordle Word?

Yes. TONKS is a valid Wordle word.

It is not on the Wordle answer list, so it is unlikely to be a daily answer.

Plurals ending in S are almost never chosen as Wordle answers.

What does TONKS mean?

An illegal immigrant of any country.“1990: United States. Congress. Senate. Committee on the Judiciary, Confirmation Hearings on Federal Appointments: Hearings Before the Committee - An agent, Larry Moy, when asked to define the derivation of the term “tonk,” replied: “...it's the sound of flashlight hitting somebody's head, tonk". [This "derivation" is incorrect - see Etymology]”

An item of value, or of perceived value, especially for sale.“How much tonk have we got to shift?”

Definition from Wiktionary, available under the CC BY-SA license.

Starter word rating: WeakIn the top 53% of all valid Wordle words for testing common letters.
Vowels: O
Unique letters: 5 of 5
Common letters: T, O

Hard-mode trap: 11 valid words fit the pattern _ONKS. If you reach it, you may need several guesses to find the last letter.

Letter ratings use how often each letter appears in Wordle answers.

Tap its tiles to the colours Wordle showed, and the Wordle Solver lists every word that still fits, with the best next guess.