Arrowheads?

hmmm arrowheads? hardly... but that could be some kind of stone tool... I can't really tell this way... I should have closer look on stone not just the picture...
Stone tools should look something like on this pic. It should have something like conspicuous gutters

Yesterday me and my five year-old put in a little garden. We managed to dig up a lot of rocks (many which became the border for the garden) but these two stuck out for their shape and for having the look of being chipped into that shape. I do live in Massachusetts, Wampanoag country, but I do find it odd that they would have still been right behind my 40 year-old house for that long. I'm sure someone here knows more than I do. Thanks for any replies.