I have never tried it and I feed live. I have noticed some of my babies wont eat anything but mouse hoppers. I give them a few mouse hoppers. Then I sent a rat fuzzy with some of the mouse bedding. Get the stinky mouse smell all over the rat fuzzy. Most of the time one or two times is all I have to do this to get them to switch. If he is feeding on mice and your trying to offer a f/t rat. That could be the reason for him not taking it. Same thing could work with a f/t rodent. Just thaw out really good and get some fresh sent on it. Mouse or rat but what ever is normal to him. If he eats mice then sent with some mouse bedding. If rats then rat bedding.