In some dialects of Arabic, the voiceless velar fricative [x] has a simultaneous uvular trill, but this is not considered double articulation either.
Several claims have been made for doubly articulated fricatives or affricates, most notoriously a Swedish phoneme which has its own IPA symbol, [ɧ].
However, this second, dorsal place of closure functions as part of the controlling mechanism of the lingual ingressive airstream used to generate the click.
Thus, much as the glottal closure of ejectives (the airstream-generating mechanism of such consonants) is not considered to be a second place of articulation, clicks are not generally described as such either.
The Bantu languages Ila, Kafue Twa and Lundwe have been described as having labio-glottal and palato-glottal fricatives.