picket-pin
/ˈpɪkɪtpɪn/North American
noun
1A pin or stake driven into the ground and used to tether an animal, secure a tent, etc.
2 United States regional. Any of numerous North American ground squirrels of the genus Spermophilus, which sit with a characteristic upright posture (more fully picket-pin gopher).
Origin
Mid 19th century. From picket + pin.