In some Ghanaian languages such as Dagbani, and Nzema, there are palatalized allophones of labial–velars. These are sometimes mistakenly referred to as labial–alveolars, though they actually have a post-alveolar or palatal articulation instead of a true alveolar one.
Something similar is found with the labialized alveolar stops in several Northwest and Northeast Caucasian languages such as Abkhaz and Lak. Although the double stop articulation may be more common, they are generally considered to be essentially labialized alveolars because the labial contact is light, and moreover the contact is between the inner surfaces of the lips, which are protruded as they are for [w]. This is quite different from the normal contact for [p] in these languages. The labial contact may also be realized as a trill. Compare the following minimal sets in Ubykh:
Some speakers of !Xóõ have a labial–dental allophone, [ʘ͡ǀ] (or [ʘ͡ʇ]), of the bilabial click /ʘ/ in some cases (Traill 1985: 103–104).
Discounting clicks otherwise as having a velar/lingual airstream mechanism rather than a double articulation, nearly all other doubly articulated consonants in the world are labial–velars. The labial-alveolars reported from some Chadic languages have upon investigation turned out to be /tp/, /db/, /nm/ and /dɓ/ sequences, not single consonants. (See Margi language.)
Levinson, Stephen C. (23 May 2022). A Grammar of Yélî Dnye: The Papuan Language of Rossel Island. De Gruyter. doi:10.1515/9783110733853. ISBN 978-3-11-073385-3. S2CID 249083265. Retrieved 16 January 2023. 978-3-11-073385-3 ↩
Henderson, James (1995). Phonology and Grammar of Yele, Papua New Guinea (PDF). Pacific Linguistics. ISBN 0 85883 428 6. 0 85883 428 6 ↩