Regarding the damages - well, we can only speculate. Probably it did not make any substantial damage, but if the toad dug near the roots and made a hollow space near them, then there was no development of the feeding roots during the fall and winter and this will influence the overall peony development. You can evaluate if you pull them out in the fall and replant them ( if it does not grow nicely over summer ). Personally I would go on the least possible damages road at the moment.
