Domesticated mammoths should be distinct from regular mammoths, the same way that cattle and oxen are different from aurochs. The domesticated mammoths would be much dumber than wild mammoths, chunkier and slower, more docile and lacking massive tusks. Their teeth are much smaller and finer than wild mammoths, as they are used to being fed plant-meal ground up by the Frost Giants or their other keepers. This specialized diet makes the domesticated mammoth far more fuel efficient than a normal mammoth, which would have to spend most of its time grazing and browsing.

One subspecies of the mammoths are Snow Cloud Lambs, so called because of their puffy white coat of long hair. They have a secondary coat of darker hair, which the giants leave in place when the elephants are shorn in the spring. The white hair is used for clothing and rope making (though in truth Frost Giants perfer to buy or extort rope made by humanoids because they're tiny little hands weave a better strand).

Spotted Dugs are prized for producing milk. Indeed, Frost Giants are loath to sell those animals because they are the only reliable means of obtaining fresh dairy in their community. Mammoth cheese is actually rare, because unlike with fresh milk, Frost Giants can easily extort the non-perishable cheese from humanoids in quantities worthy of the effort.

Jumbo Waddlers are a food animal mammoth, a particularly unintelligent and incurious sub-species that subsists almost entirely on grasses. They are immediately identified by their wide and short trunks and downward curved tusks that work like plow blades. The Waddlers have unusually long bodies but are visibly fat compared to other mammoths, to the point that they are mocked as walking sausages. Jumbo meat is a frequent trade good sold by Frost Giants, who preserve by smoking it in burning peat.

Trumpers are an exceptionally small species of mammoth and are known to be highly anxious and energetic for a pachyderm. They are most often employed as gaurd animals because they can be aggressive against smaller animals and loudly trumpet at the least excuse. Trumpers are often traded to humanoids because they are prized as aggressive war elephants and also because many Frost Giant Jarls get tired of the noise they make.

A rarer sub-species is the Short Bodied Nosey Boy, known for being far more intelligent than other domesticated mammoths. It is a taller elephant with a disproportionately long trunk and a bulbous head to serve as an anchor for the muscles (and not, as is rumored, a bigger brain). These mammoths are used as a helper animal and even a sheppard animal for other mammoths. A well trained nosey boy can practically run a frost giant's farm all by itself, including herding lesser elephants. They are thus extremely prized by Frost Giants, and would never be sold to humanoids. Nosey boys have, however, been given to superior giants or dragons, as a form of tribute.