ft pinkies will go down fine.. and they can go months without food, so no need to worry. Just leave him a single pinkie on a little plate every week, he may need some time to adjust to the new environment. May take a while before he starts eating. If after another 4 weeks he still didn't eat, put him and 1-2 pinkies overnight in a small box (with some airholes) without any substrate.
Don't stress him out by stuffing food down his throat..