Chelly tree, for example

• Speech defect involving excessive use or unusual pronunciation of the phoneme `l'

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Lambdacism \Lamb"da*cism\, n. [L. lambdacismus, Gr. ?, fr. la`mbda the letter lambda ([Lambda]).] A fault in speaking or in composition, which consists in too frequent use of the letter l, or in doubling it erroneously. A defect in pronunciation of the ...

Wiktionary Word definitions in Wiktionary
n. (label en linguistics) A pronunciation shift whereby /l/ or other closely-related phonemes are spoken instead of other sounds (typically /r/).

WordNet Word definitions in WordNet
n. speech defect involving excessive use or unusual pronunciation of the phoneme `l'

Wikipedia Word definitions in Wikipedia
Lambdacism (from the Greek letter lambda ) is a medical condition or speech impediment related to the pronunciation of / l / or related phonemes . A common form of lambdacism is lallation , the substitution of / l / for / ɹ / in pronunciation. It is a common ...