Is this poem a Petrarchan Sonnet?

No, it's not. If you look up the rhyme scheme for a Petrarchan sonnet, you'll find that the first eight lines rhyme abba abba. (The final six lines can rhyme in a number of different patterns.) This Robert Frost sonnet has what's called a terza rima rhyme scheme. If you're interested, you can web search "terza rima" for further information.