Hmm, have not run into any Attack Turkeys myself, but I'd imagine most birds might attack if you threatened their nest or babies. I've been chased by a Canada goose up in Vancouver, but that's the extent of my experience with vicious birds. Have heard stories of people being pecked in the face by Sandhill Cranes too, and they are huge, tall birds with heavy beaks that could do a lot of damage.
Your turkeys look very content, Lindsey. Let's hope the parents can stoutly defend that brood of young ones and also keep them off the roads!