and what are its uses in piracy?
To attack and take-by-force much larger vessels including sloops and even barca-longas
Pirogue
Caribbean pirates using pirogues to attack and take-by-force much larger vessels including sloops and even barca-longas. 
what is ambohimanga? A hill and traditional fortified royal settlement in Madagascar from where did it get its name? It is a noun-adjective compound in the standard Malagasy language composed of two parts: "ambohi", meaning "hill", and "manga", which can mean "sacred", "blue", "beautiful" or "good" which people reside in that settlement? Merina people mention a few rituals followed by them? They ritually kill their cattle with unusual violence, cook and consume beef prepared thereafter ceremoniously what type of social groups or hierarchy do these people adhere to? Thry were divided into three strata: the "Andriana" (nobles), the "Hova" (freemen), and the lowest strata called "Andevo" (slaves) what privileges does the former enjoy? Land ownership in Imerina was reserved for them and the populace owed him and the king a certain amount of free labor each year are these people subject of a kingdom? Yes.  While the term and concept of Andriana is studied with the Merina people of Madagascar, the term is not limited to them. The use of the word "Andriana" to denote nobility occurs among numerous other Malagasy ethnic groups what type of technologies were there in the kingdom? The technique of silver smithing, iron smithing and the construction and use of pirogues what does the latter mean? Any of various small boats, particularly dugouts and native canoes in the context of the military, what are its uses? To attack and take-by-force much larger vessels though such vessels were used mainly for scouting or as tenders
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Pirogue [SEP] Uses in military and piracy contexts
In 626, when the Avars were besieging Constantinople, the Slavs crossed the Golden Horn in their pirogues and landed on the shore of the Lower Blachernae, and in spite of all defensive measures that were taken, looted churches. There are accounts of 17th and 18th century Caribbean pirates using pirogues to attack and take-by-force much larger vessels including sloops and even barca-longas. Pirogues were used extensively by pirates and buccaneers throughout the Caribbean, the now-Mexican and Gulf Coasts and the East Coast of what is now the United States. For the most part, though, such vessels were used for scouting or as tenders.