Dryads

"Be still, my princes, I have urgent news from your sisters."

- a Dryad speaks to Peter and Edmund Pevensie

Dryads were spirits of Narnian trees. They were able to assume physical bodies similar to human form, and the same size as normal humans, and they could go in and out of their trees like blossom petals. They appear as minor characters in The Chronicles of Narnia film series.

The Chronicles of Narnia: The Lion, the Witch and the Wardrobe
Two dryads are seen greeting Lucy as she, her brother, and sister enter Aslan's camp. Later a dryad comes to tells Peter and Edmund of Aslan's death.

The Chronicles of Narnia: Prince Caspian
A dryad appears in Lucy's dream of meeting Aslan when she and her brothers and sister enter Narinia again.

The Chronicles of Narnia: The Voyage of the Dawn Treader
Reepicheep told of a dryad singing him the verse for the Utter East while he was still in his cradle.