You are not alone. Any time a thread brings that game up there's someone like us who got stuck there because that's literally the only dungeon in the entire franchise that requires you to defeat enemies in a specific way based on lore that isn't provided to you by the game. Not even in the manual does it say "This is a stalfos, this is a Pol's voice, this is a keese." I found out through an old NES Zelda manual, that does give names and pictures of the enemies - ten years after my initial romp through bottle grotto.