Mammoth is most certainly a volcano. There is an active volcano watch there by the US Gelogical Survey. Its active too, most eruptions are from the geologicly recent history (like 200-600 years ago). I did some googling, and yeah, Tahoe isn't a volcano, even though it really looks like one.
The Sierra's are tetonic in origin, but there is also magma under these hills. Isolated pockets of magma, and in some cases (like the Long Valley Caldera), active volcanos.
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