GIVE ANSWERS - 한국어

The correct spelling is ”존댓말”
jon-daen-mal is kinda correct. It’s pronounced like ”존댄말”
받침(supporter) that can be pronounced are only ㄱ, ㄴ, ㄷ, ㄹ, ㅁ, ㅂ, ㅇ and ㅅ is not one of them.
According to 자음동화(consonant assimilation) ㅅ turns into ㄴ