A young person who is inexperienced or immature, or a type of marine fish with greenish coloring found in North Pacific waters.
From 'green' plus the suffix '-ling' (meaning 'young one' or 'inferior'). In the fish sense, it refers to the bright green coloration of some species in the genus Hexagrammos.
Greenling fish are surprising parents—some species practice mouthbrooding, where the male literally protects eggs inside his mouth until they're ready to be released, making him the ultimate helicopter parent!
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