37 cards where (the card types include “squirrel” or the text includes “squirrel”) and it’s legal in Commander

Acorn Catapult (Commander 2011 #241)
Acorn Harvest (Torment #118)
Animal Friend (Fallout #72)
Chatterfang, Squirrel General (Modern Horizons 2 #151)
Chatter of the Squirrel (Double Masters #157)
Chatterstorm (Modern Horizons 2 #152)
Chitterspitter (Modern Horizons 2 #153)
Cloakwood Hermit (Commander Legends: Battle for Baldur's Gate #221)
Comet, Stellar Pup (Unfinity #166)
Deep Forest Hermit (Modern Horizons #161)
Deranged Hermit (Vintage Masters #202)
Drey Keeper (Modern Horizons 2 #194)
Druid's Call (Odyssey #239)
Helica Glider (Ikoria: Lair of Behemoths #15)
Krosan Beast (Odyssey #248)
Liege of the Hollows (Weatherlight #131)
Nantuko Shrine (Odyssey #256)
Nested Shambler (Modern Horizons 2 #95)
Nut Collector (Dominaria Remastered #171)
Prairie Dog (Outlaws of Thunder Junction #24)
Ravenous Squirrel (Modern Horizons 2 #211)
Scurrid Colony (Strixhaven: School of Mages #142)
Scurry Oak (Modern Horizons 2 #172)
Specimen Collector (Modern Horizons 2 #64)
Squirrel Mob (Modern Horizons 2 #286)
Squirrel Nest (Dominaria Remastered #177)
Squirrel Sanctuary (Modern Horizons 2 #174)
Squirrel Sovereign (Modern Horizons 2 #175)
Squirrel Squatters (Unfinity #156)
Squirrel Wrangler (Prophecy #127)
Swarmyard (Time Spiral Remastered #284)
Toski, Bearer of Secrets (Murders at Karlov Manor Commander #191)
Trendy Circus Pirate (Unfinity Sticker Sheets #2)
Underworld Hermit (Modern Horizons 2 #105)
Vedalken Squirrel-Whacker (Unfinity #63)
Verdant Command (Modern Horizons 2 #182)
Xenosquirrels (Unfinity #96)

This search is finished. Now the real work can begin.