Dont worry about it. young or freshly wild caught tokays are often afraid of rodents, because rodents can easily maim a small or severely stressed animal. I have a snake who had his eye bitten through by a mouse before I got him, they do have very sharp teeth. So let him get older, or acclimate and then he should eat pinks with gusto. but there is a drawback on pinks, they have a lot of fat in them and although tokays love them, you shouldnt feed your precious lizard very many, because fat can damage thair livers and kill them prematurely. My big male LOVES pinks, but was terrified of them until he was about 2 years old.
good luck and have fun!