Icefall n. : A frozen waterfall, or mass of ice resembling a frozen waterfall.

Example:
How do I reach the back of Icefall Cave in Pokemon Leaf Green?

Taxonomy
Khumbu Icefall, Icefalls, ice flows, Ablation zone, free encyclopedia, Accumulation zone, Search, Roosevelt Glacier, glacier ice, ice, Antarctica, glacier bed, rapid flow, speed, kilometres, Blue ice, Glaciers, fractures.

Defination from the web:
icefall is a portion of some glaciers characterized by rapid flow and a chaotic crevassed surface. ... Ablation zone · Accumulation zone · Bergshrund · Blue ice · Crevasse · Dirt cone · Firn · Glacier terminus · Ice divide · Icefall · Ice tongue · Moraine · Moulin · Sérac ...