I would just water. The toad liked soft soil because it was easy to dig.
They need to hibernate below the frost line, which may be down to 50 cm, even up to a meter in colder zones. In your temperature zone, it is probably not that deep. Since the soil is so soft around the peony, watering might be enough. The soil will simply settle around the roots. It is unlikely that the little toad made any damage.
I would just water well. However, I would also make sure that the toad has enough soft soil to dig beside the peony because toads cannot survive being frozen. Hopefully, there will be no more frost this year. Toads are very useful, and you might want to encourage them to stay in your garden. You can even make them a little "shelter".