if the distributor's handling practices are good, there is no problem with commercial frozen raw food. if you open the box and the package has "ice crystals" inside, then the food is either old and it's freezer burn, OR the product did not stay completely frozen during transit and you could be paying for tainted food
if you feed 100% raw frozen patties, you don't need to add anything to the diet BUT unless you're well off, you'd do better to supplement up to half the meals with human-grade ground meats you find on sale (lean ground beef, lean ground pork, turkey, chicken...) and 1 tsp of ground eggshells per pound of raw meat, to balance out the phosphorus-calcium ratio. I'm assuming here you don't want to feed raw meaty bones, such as whole chickens, turkey, fish, pork, goat, etc?.... which is why i suggest the raw ground meats. you'll save a ton of money AND you know exactly what you're feeding your dog
oh and whole eggs, shell included, make a fantastic addition to any raw meal, commercial or home-made...