In some ways it is. Grey Owl was a real figure, but there might be some elements that have been embellished or fictionalized for the sake of the narrative.
Owl Moon is definitely fiction. It creates a fictional world with characters and events that are not based on real-life facts. The author uses creativity and imagination to weave the tale.
The following are some poems with the word 'owl':
The owl eats the grain and chirps. Book of Songs, Xiaoya, Che Xia
The peach trees planted in the eastern fence did not grow new branches. Fresh birds come, when the oxen are in bud. Song·Lu You's Spring Journey to Qiantang Lake
3. The tree monk by the bird-dwelling pond knocks on the moon door. Tang Dynasty. Bai Juyi's "Farewell to the Ancient Original Grass"
The mountain is heavy and the water is heavy. There is no way out. There is another village in the dark. Tang·Lu You's "Mountain West Village Tour"
The wild path is dark with clouds, and the boat on the river is bright with fire. Tang·Du Fu's "Ascending"
6. In the middle of the night, I lie listening to the wind and rain, and the iron horse and the ice river fall into my dreams. Tang Dynasty·Lu You's "Night Moored on Niuzhu Recalling the Past"