凍 is built from the 冫 (ice) and 東 components.
It reads トウ like 東, as do 棟 — learn 東 once and the family's reading comes with it.
A common word using 凍 is 凍る (こおる), meaning “to freeze, to be frozen over, to congeal”.
Kanji that look similar include 准, 凌, 弱, and 寒.
