@patchlore if th ⟨θ⟩/⟨ð⟩ is a voiceless/voiced dental fricative, and l ⟨l⟩ is a (voiced) lateral approximant, then maybe you've heard a lateral fricative?

https://en.wikipedia.org/wiki/Voiceless_alveolar_lateral_fricative

https://en.wikipedia.org/wiki/Voiced_alveolar_lateral_fricative

(pages have sound samples)