You COULD....but why wouldn't you make your own pie crust? If you use store bought crust, I would go with the puff, just dock it well and press down the folds so it doesn't open up on you. It'll look different, but hopefully a bit more dramatic, and I find frozen puff pastries to be of a higher quality than store bough pie crust.
Basically, yes. Recipe headnote emphasizes the butter in the pastry, so if you get ready-made crust, go for one with butter.
About puff pastry, here's another recipe for technique.
http://www.simplebites.net/make-a-savory-galette-for-simple-fall-entertaining/
Last, here's another thread from food52 about making a (savory) galette without a recipe, again for technique & adaptation.
https://food52.com/blog/11538-how-to-make-any-savory-galette-without-a-recipe
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About puff pastry, here's another recipe for technique.
http://www.simplebites.net/make-a-savory-galette-for-simple-fall-entertaining/
Last, here's another thread from food52 about making a (savory) galette without a recipe, again for technique & adaptation.
https://food52.com/blog/11538-how-to-make-any-savory-galette-without-a-recipe