Chatterfang, Squirrel General is a mythic Legendary Creature — Squirrel Warrior card from Jumpstart: Historic Horizons (J21), collector number 552.
Forestwalk (This creature can't be blocked as long as defending player controls a Forest.) If one or more tokens would be created under your control, those tokens plus that many 1/1 green Squirrel creature tokens are created instead. {B}, Sacrifice X Squirrels: Target creature gets +X/-X until end of turn.