Troma Nagmo (Dudjom Troma)
The dynamic figure of Troma Nagmo (khros ma nag mo), the ‘Wrathful Black Mother’ (Skt.Krishna Kali, Krishna Krodhini), dominates the centre of this gold-on-black composition.
She is extremely fierce, youthful and nubile like a sixteen-year-old, and black in colour like the darkness at the end of time.
With her right leg drawn up and her left leg bent in ‘bow-and-arrow’ posture, she dances upon the golden sun-disc of her lotus seat, with her left foot pressing down upon the breasts of a naked female demon that has been thrown down onto her back.
This fierce demon reveals her sharp teeth and vagina, and her breasts are the ‘seat of desire’, thus her corpse represents the concept of the self-cherishing attitude that is sacrificed through the practice of the chod ritual.
Source
(Tib. Troma Nagmo) can be accompanied by four dakinis, so that together, they are the Wisdoms of the Five Buddha families.
Troma (Khros ma), a gcod practice focused on Khrodakālī.
Dudjom Lingpa's revealed treasures of the practices and teachings of the chod cycle of Troma Nagmo, the Extremely Wrathful Black Mother. Root Terma texts and sections have been arranged, clarified and edited by His Holiness Dudjom Rinpoche
Source
http://blogs.orient.ox.ac.uk/kila/2011/09/19/the-wonderful-orgyan-ling-manuscript-kanjur/