Is there a herb or plant called "Locust" apart from the typical grasshopper or locust?

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The food of John the Baptist was locust and wild honey.

“And the same John had his raiment of camel’s hair, and a leathern girdle about his loins; and his meat was locusts and wild honey.” (Matthew 3:4, KJV 1900)

Is there any herb or vegetable that might possibly be the locusts of the verse quoted? Are there any biblical or extra biblical sources that talk about this?

I am looking specifically for any evidence that may point that the locust is a herb or shrub and not an insect!