Is it deer resistant?

Yes

Mutant Tanoak is deer resistant.

Notholithocarpus densiflorus

Deer: Rarely
Zones: 7–8
Light: Full sun

Shrub
Tree

Mutant Tanoak (Notholithocarpus densiflorus)

Photo: Awinch1001 · CC0

Also called Tanbark-Oak, Tanoak

Shrub Notholithocarpus

More details

Light: Full sun, Partial shade
Type: Shrub, Tree
Maintenance: Low
Growth: Slow
Bloom: Spring, Summer
Foliage: Evergreen
Features: Drought tolerant, Flowering