The Flintstone Kids

I Think That I Shall Never See Barney Rubble as a Tree (1x29)

Air date: Jan 17, 1987

Barney goes to a doctor and gets a shot, then falls asleep near a tree. Later, when some doctors visit that tree to examine it, they discover it's sick and needs to be treated. Freddy overhears their conversation and thinks they're talking about Barney.