I found some frozen Greek yogurt at the grocery store today. Adding skin or almond milk and protein powder would qualify as a protein shake wouldn't it? I'm on day 10 post op and will be starting protein shakes on day 14. How much do you drink at once? (my plan is for only 2 ounces at one time, but also states you can do this every 15 mins)

Not sure that is the best option. The only concern I would have is how much sugar is in the frozen greek yogurt? A Premiere Protein Shake has 4g carbs, 1g sugar and 30g Protein. That frozen yogurt, even though it's greek, probably has between 7-15g sugar in a half cup serving? Thats a lot of sugar, especially early on. I am not a nutritionist, so you should refer to your surgeon or nutritionist for confirmation, but I would maybe find another, lower sugar alternative. Best of luck.