Softening nougat candy
If you put them in a humid environment they'll absorb moisture.

If you have a deep enough bowl with a lid, put a glass of water in the middle and surround the glass with the candies.  Keep the lidded bowl in a room-temperature place for a few days where it won't be bumped (you don't want the water to spill...).  Stir the candies a few times to keep the moisture evenly distributed and to prevent them from sticking together.