“The pukamani poles are of a quality not on show anywhere else in Australia or the world,”
“A set of ornately carved wooden funeral poles are the same style of those still used by the people of the Tiwi Islands for the pukamani ceremony, which is believed to send the soul into the spirit world to live on forever.”
I'm not sure what language pukamani is from. Probably Tiwi. Like most Aboriginal languages it has never had a written form. A transcription in English depends on how a linguist hears it; there can be differences of opinion. There can also be regional variations in pronunciation.
I listed pukamani pole because the artist who painted the poles I found used that spelling. Pukumani is certainly plausible.