When it comes to any other recipe not using an instant pot, cooking with frozen chicken is always more cumbersome and difficult. You will need to thaw it and carefully watch it to make sure the chicken is cooked properly. God bless the guy who invented Instant pot. It just made cooking with frozen chicken so easy. The only adjustment needed is to allow a little more time. You do not have to thaw it outside thus saving a lot of time. Just add frozen chicken straight from the freezer to the pot and close the lid. Set the timer to 15 minutes (i.e. double the time) and lo behold your frozen chicken is cooked as well as that of room temperature.