An immature swan is called a cygnet. Cygnet is the term used for young swans, typically before they reach one year of age. They are usually gray or brown in color, which distinguishes them from adult swans that are predominantly white. As they mature, cygnets gradually develop their adult plumage.
An immature butterfly is called a caterpillar.
An immature or baby eagle is called an eaglet.
A female swan is called a "pen". (A male swan is called a "cob")
An immature sow
An immature female sheep is called a ewe lamb. An immature male sheep is called a ram lamb.
If you mean a young swan, it's called a cygnet
A baby swan is called a cygnet.
A female swan is called a "pen"
A baby swan is called a "sygnet"
A female swan is called a Pen.
The swan is associated with the myth of Leda. Cygnus is Latin for Swan, with Cygnet ( sounds like Signet, which is a publisher!) an immature one of the type favored by Mr. Anderson.
An immature female duck is called a duckling. Once the female duck matures it is called a hen or duck.