What this suffix does
The suffix -ling comes from Old English and forms nouns with two main meanings:
1. Young creature or small being: duckling, gosling, sapling, nestling, yearling, fledgling.
2. Person in a secondary, subordinate or diminished position: underling, sibling, foundling, changeling.
Spanish equivalents vary: -illo/-ita (patito), specific words (exposito), or young + noun.
Fledgling and sapling: the two most literary
"fledgling" = 1. a young bird learning to fly; 2. (metaphor) a new, inexperienced enterprise or person: "a fledgling democracy." "a fledgling business." Very common in journalism and essays.
"sapling" = a young tree: "plant a sapling." Metaphorically: a young flexible person.
Both appear frequently in literary and journalistic English.
Sibling, underling and changeling: the most used
"sibling" = brother or sister (gender-neutral): one of the most-used -ling words in modern everyday English.
"underling" = a person of lower rank; a subordinate or lackey: "He was merely an underling." Slightly disparaging.
"changeling" = in European folklore: a child substituted by fairies. Appears in Shakespeare (A Midsummer Night's Dream) and fantasy literature.
"foundling" = an abandoned child who has been found: appears in Dickens and 18th-19th century literature.