A single one is called a flinn, some of them are called flinns, and full linked convoy is know as a flinneon. These terms are misused easily and often.
Bred into domesticity, they are blinded from maturing out of the fry state of development. This has been found to make flinns more docile. For this reason, you need a flinn flier who is skilled at riding the big fish to guide them. Roping together flinns into a flinneon of convoy can be a very efficient way of transporting goods and people across long distances or difficult terrain.