I believe the frog quest can make the player character too powerful because one is able to complete the quest an infinite number of times according to an online source. I also learnt that every frog will become a prince given enough kisses. I read on another website that the chance of growing a wart instead of being rewarded is just 25%. Relatively speaking, potions of exchange at least used to be fairly common so having Music or Calm Monster likely makes one able to increase a few attributes to 99. Due to the quest picking a female player character is excessively better than choosing a male one as long as Music or Calm Monster will be available.

Edit: This request can probably be ignored or removed. Please see my latest post in the comment thread below.