Yup, though they can do the same with Minthara as well. A simple dialogue asking her not to indulge if the player never used the tadpoles. Or simply not enabling it at all if the player never used the tadpoles.
After all Astarion too despite wanting to munch every tadpole in sight, won't do it without our say so. So with Minthara this is just a result of rushed development causing a gameplay bug/oversight that directly clashes against the narrative of our main character, but it should not be a huge issue for Larian to fix 'if they care to fix it'.
