Sung syllables are a type of vocalization that involve singing or chanting words or syllables. The term 'sung syllables' is often used to refer to the repetition of a single syllable, such as in a chant or a song. The crossword solutions for the term 'sung syllables' include TRALAS (6 letters), LAS (3 letters), TRALA (5 letters), and LALALA (6 letters). These words all represent different types of sung syllables, with TRALAS and TRALA being two-syllable words, and LAS and LALALA being single-syllable words.