11 cards where the text includes “reach” and the card types include “treefolk”

Cloudcrown Oak (Duel Decks: Mind vs. Might #45)
Colfenor, the Last Yew (Commander Legends #274)
Ezzaroot Channeler (Commander 2021 #60)
Generous Ent (The Lord of the Rings: Tales of Middle-earth #169)
Gnarled Sage (Core Set 2021 #187)
Great Oak Guardian (Commander 2019 #170)
Harold and Bob, First Numens (Fallout #78)
Magnigoth Sentry (Dominaria United #172)
Nemata, Primeval Warden (Dominaria United #209)
Reach of Branches (Modern Masters #158)
Timberland Ancient (March of the Machine #210)

Though this query has ended, its relics still slumber in New Argive.