What's the proper term to describe the corrugated metal material used as the roof of many homes in Nazon?

If you mean the "tin roof", they are called "tòl" in Haiti.
A house that's covered with corrugated tin roof is called "kay tòl"

Living under these tin roofs you hear everything: the landing of the birds, the crash of the ripe coconuts, the rain drops, even the faint noise of the falling dry leaves. At night when it's even quieter, you'd think you heard the footsteps of a "lougawou". And when it's windy, the clatter of the tree branches never stops.
The worst I remember is those sunny days. When the sun is hot and bright consider everything under that tin roof roasted.

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