Truly co-articulated labial–palatal consonants such as [p͡c, b͡ɟ, m͡ɲ] are theoretically possible.3 However, the closest sounds attested from the world's languages are the labial–postalveolar consonants of Yélî Dnye in New Guinea, which are sometimes transcribed as labial–palatals.
Maddieson, Ian (1984). Patterns of Sounds. Cambridge Studies in Speech Science and Communication. Cambridge University Press. p. 95. ISBN 0-521-26536-3. 0-521-26536-3 ↩
Maddieson, Ian (1984). Patterns of Sounds. pp. 92, 292. ↩
Howe, Darin (2003). Segmental phonology (PDF). University of Calgary. pp. 7–8. http://www.ai.mit.edu/projects/dm/featgeom/howe-segphon-book.pdf ↩