Can pawn's take out a king?

Of course a pawn can deliver a mate (if that's what you mean by "take out"). It's uncommon but it definitely happens. Just one example:
https://www.chess.com/forum/view/general/smothered-mate-with-a-pawn
Of course a pawn can deliver a mate (if that's what you mean by "take out"). It's uncommon but it definitely happens. Just one example:
https://www.chess.com/forum/view/general/smothered-mate-with-a-pawn