maybe they were making out and they bit the tongue off
or, they ate the tongue for food
or since things become brittle when they freeze it could have just frozen and cracked and falling off, just like a banana in liquid nitrogen.
or a animal came by and ate it for food
and yeah if an avalanche or just heavy amounts of snow were pushed against someone, it could hurt then internally due to pressure.
they found the bodies more then month later, so maybe snow level decreased
for the tents being ripped, someone could have farted and they ran out.
but couldnt find the tent again.
its a cool story, they could do a history channel thing, like the Bermuda triangle where there are tons of different view points to what could have happened