[Jazzid]

Hi!
If the villagers are hostile to you, and if you've killed any of them you cannot complete the toad village quest. However, that quest is not important for finishing the game.

To answer your second question... if you've had your three warriors deliver the potion separately all of them should be given credit. You might have had one warrior deliver the potion twice. That's all I can come to think of.

//Jazzid