It is called a "raft".
Using 'a raft of' preceding a noun is a term for a 'large quantity' of that thing.
flatboat
On his voyage from South America to Polynesia, his raft was called the Kon-Tiki. On his voyage from Egypt, he used a raft called the Ra.
A large group of sea otters is called a raft.
is called raft
I do not know. Why can't you answer it. That's my answer.
raft
That's called a 'raft'.
No. Heyerdahl sailed from Peru to Polynesia on the raft Kon-Tiki. Later he sailed from Egypt to the Caribbean on a raft called the Ra.
herds
The actual swelling of a life raft would be called inflation which is a physical change.