Simple past tense and past participle of munch. (verb)
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Use "munched" in a sentence
"Here in Mazatlan shrimp capital of Mexico, huge dried shrimp are sold year round by the seafood changeras and are munched on whole con cascara y todo like popcorn or shrimp jerky by the local beer drinking crowd for about 50 weeks as a botana."
"I mean, he would take a bite and then go back to the bar, get more fixins, and then use the tongs to tamp them down on the just munched part of his pita."
"Zipping the bag up again, he gently munched on the one he had taken out, while talking to his sister with his mouth full."