I'm not talking about healing, his resurrections isn't revivify (which require the original body), it's true resurrections. It recreate a whole new body, tadpole free.
Gale's true resurrections scroll should also cure him of the tadpole.
It should cure him of the tadpole, yes. However, I have a feeling that the writers will say "The tadpole cannot be removed in such a way, it's a special case. The power behind what is keeping the tadpole there is unique".
They may also say that it isn't a wound, poison, disease, or curse, but rather a parasite or "part of you": if you're brought back, you're brought back with the tadpole.
True resurrections just take your soul to bring your back and you need to be willing on top of it. If the tadpole is now your soul than we are already mindflayers at the start of the game.
And that's not the intent, because there are dialogues about the tadpole feeding on something inside of you that isn't physical, aka your soul.
