"Behemoths" and "ancient behemoths" are the names of monsters that have appeared in many different RPGs such as Dungeons & Dragons, Final Fantasy, etc. The physical appearance of behemoths depends on the series. In some series they appear beast-like and in others dragon-like. All are based on the biblical behemoth.
The appearance of the behemoths (giant, four-tusked elephants) is similar to how the mûmakil (aka oliphaunts) from The Lord of the Rings are depicted in the movie adaptations.
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They are called ancient behemoths by Kalecgos and behemoths by Mordis, although it is unknown if this is the actual name for the creature or if they are just describing them based on their size.
It is unknown if they are related to the mammoths of Northrend. They may be mammoths which wandered, before the Great Sundering, to the Alterac Mountains and died there.