凍土 is read as とうど (toudo) and means frozen soil.
とうど
toudo
えいきゅうとうど
permafrost
こおる
to freeze
とうし
death from cold
こごえる
to freeze (of one's body)
こおらす
りょうど
dominion
おうど
loess
ほっぽうりょうど
Southern Kuril Islands (administered by Russia, claimed by Japan)
けんど
prefectural land
けんせつざんど
construction waste soil
じゅうまんおくど
eternity
かいがいりょうど
overseas territory