pacman frog and box turtle

Question
Hi, I just rescued a huge pacman frog from poor living conditions.  He is about 5-6" across.  I know he is carnivorous but I also have two box turtles I would like to put with him in a very large tank.  There is no way he could eat the turtles.  They are twice a large as him. I didn't know if he would try to hurt them? Or are they compatible to the same tank?
I would really appreciate any information you may have.

Answer
I never recommend keeping different species together as there will usually be competition for food and this goes without mentioning zoonoses which can cross species.  Also the humidity and heating requirements can be different for the species.  Given what you have told me I would suggest against it if possible at all.