1. to become bigger and rounder, as if it had been filled with air. This is a picture of puffed rice. https://www.bindowkart.com/product-images/9738-puffedrice.jpg his hair was acting as if it had been puffed. This is a picture of puffy hair: https://tinyurl.com/yyxdj9ut 2. Probably not. I'd need to see more context. Under the heat of the sun, his curly hair puffed into a ball on top of his head= active voice, past tense She looked at the curly blonde hair puffed into a ball on top of his head= passive participle, the head of an adjectival passive participial phrase "puff" is one of the rare verbs where passive and active voices yield very similar meanings. I puffed the pillow to make it softer. The pillow puffed (itself) up under the heat of the sun.