Definition of quackling in US English:

quackling

noun

  • The action of quackle, quacking; an instance of this; (also humorous) a duck or duckling.

adjective

  • Quacking.

Origin

Mid 18th century; earliest use found in Eliza Haywood (?1693–1756), author and actress. Apparently from quack + -le + -ing<br>mid 16th century; earliest use found in William Bullein (c1515–1576), physician. Apparently a variant of quacking (although this is apparently first attested slightly later).