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The Power Mammoth was released by Hasbro durring the NAR line. It was one of three zoids that shared the "Power" prefix; the others being the Power Mantis, and the unreleased Power Kong . The zoid was released right before the NAR line's cancelation. As a result, the zoid was slightly overstocked, with the leftover stock being sold in Europe, mostly in the United Kingdom.
Due to the zoid being a Hasbro exclusive, and never released in Asia, no offical backstory was given on this zoid, however the stickers indicate it was member of the Guylos Empire
Due to the shared prefix of the Power Zoids, it is often assumed that they would have had an official fusion. As the line was cancelled and the Power Kong was unreleased, it is impossible to know for sure if this may have been true.