Sure is! Just about every pet store carries some kind of coprophagia deterrant...
My parents have used
Deter in the past with some success.... All the pet stores in my area carry this kind. Drs. Foster & Smith also carry something called
Dis-Taste
Sometimes this stuff takes a couple weeks to start working, so if it doesn't stop right away don't be discouraged. Give it a while to see if it'll help. In the mean time, try to pick up any messes the second you see them so he can't eat 'em!