To me, that looks like a slightly tubby Yellow Pineapple VT male.
Males can often display the little white 'egg spot' as well. Actually if you look close enough, you can probably find them on most fully grown adult males too, not just young ones.
If you know what to look for, males and females are fairly easy to tell apart by looking at the body shape, but a slightly easier and decently reliable way is to look at the ventrals; a males ventral fins will always be longer and fuller then a females.
Also, if you can get your fish to flare(usually a mirror does the trick), on a male you should see a nice big beard. Some females have big beards as well, but for the most part nothing compared to a males beard.
I doubt hes a giant or king. A lot of VTs are a little on the large side, but its just the way they're built really.
Pet stores often mislabel their fish. Its a very, very common occurrence. ;)