No you will just have to give the toad the potion again.
From the sound of it you didn't let your priest get recognized as completed the quest. After you give the toad the potion just go to the guild and have the character selected and wiat until he is done talking WITHOUT clicking on anything and you will now have completed the quest and can do the next quest, which i think has to be the easiest guild quest so far.
Hope that helps if not reply back and I will try to be more clear
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