I have not seen a single dialogue or hint in the goblin walkthrough that we can save the tadpole and use its power, that is the problem
Because they don't know the tadpole exists lol.
Then the voice of the narrator is needed to give at least some logic to help those who do not know anything about our problem to kill those who know its solution
Thanks to Larian for Baldurs Gate 3 and the reaction to player feedback