Packing winds of up to 195 kilometres (120 miles) per hour, Mocha made landfall on Sunday, downing power pylons and smashing wooden fishing boats to splinters.
"We can confirm there are 17 deaths," Karlo, the administrator of Bu Ma village near the state capital Sittwe.
"There will be more deaths, as more than a hundred people are missing."
The village is inhabited by the persecuted Rohingya Muslim minority.
That leader requested anonymity due to fear of reprisals from the country's junta.
The junta said on Monday that five people had been killed, without specifying exactly where they had died.
It was not clear whether the junta's death toll included any of those killed in Bu Ma and Khaung Doke Kar.
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