It's just called a colt or filly, like other horses. They also add the breed name - like Arabian, Egyptian, Morgan or whatever breed. After it becomes 4 years old it's called a stallion.
The girls are mares and the boys are stallions.
Stallions is the plural.Stallion is the singular.
Female horses are called a mare. Male horses are stallions.
Baby horses are called foals whether a boy or girl. Baby horses under the ages of 4 are [boy]colts and fillys[girl]. When a horse is over the age of 4 they are a mare[girl or a stallion/gelding[boy]. Geldings are castrated males. Stallions are not castrated, and studs are stallions used specifically 4 breeding.
Male horses that haven't been snipped are called stallions
Like any other stallions do.
Doncaster Stallions was created in 1969.
Augusta Stallions ended in 2002.
Augusta Stallions was created in 1999.
Houston Stallions was created in 2010.
Oklahoma Stallions was created in 2010.
Birmingham Stallions was created in 1983.