The standard procedure is to either remove the scrotum altogether, or to open it and remove the testicles. My boys have had the latter procedure and the pom is shrunken, almost (but not quite) invisible. I would say that if you're feeling two little BBs in there, he's still got 'em.
The bald spot isn't really bald, it's a scent gland on the forehead that in an intact male will secrete oil, which slicks down the fur there and makes it look bald. When they're not producing testosterone, the oil secretion stops, and it goes away.
If you're feeling testicles, but there's no spot, and he's mated without results, it seems to me that he's sterile. But only a vet can tell you for sure.