What is the correct spelling for the french marine engines that sound like 'pieod' or 'piehod'?

This question was asked recently by Keredg and was closed without a proper explanation. It has since occurred to me that Keredg may have been thinking of the French shipbuilders St Nazaire-Penhoët. They certainly constructed large marine diesel propulsion engines of MAN design. They may also have built smaller units, possibly receiving the designs as post world war one reparations.

MAN engine design information was also made available to Fraser & Chalmers Limited, a company wholly owned by the British General Electric Company, and it is true that the spoils of war were shared among all of the allies.

I believe that there is a Penhoët-MAN 5 cylinder engine in the Vickers-Armstrong Museum collection.