It probably cant regularly unless you have a special way to hack it to other than that it cant learn Sheer cold.
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Feraligatr cannot learn Sheer Cold.
Articuno learns sheer cold at a level 85.
Unfortunately, no :( I wanted to have a team of a No Guard (All attacks from any pokemon on the battlefield have 100% accuracy) with a Froslass with Sheer Cold, but only Glalie can learn Sheer Cold from that evolutionary line.
Walrein learns sheer cold at level 65. It is the last attack he ever will learn if you don't use any tm's or move tutors.
In Pokémon FireRed, Articuno learns Sheer Cold at Level 85.