He is a buck, does his skin look orangey? or flaky. And does his fur seem greasy? Bucks get something called Buck Grease which can give there fur a scruffy, unhealthy look but its justtheir hormones and some bucks get it and some don't, it all depends on the rat.
Otherwise if he is itchy he may have mites, check his fur for lice or anything creepycrawly lol. mites you can't see but check near the neck, under the chin and behind the ears for scabs, this could be where the mites are and so he will itch till he gets scabby.
It's not a big deal if it's mites, just get some spot on or the visit the vets to get an injection... the spot on is cheaper

hehe
Love his name lol
