A female monkey is just called a female. Although gender-specific terms apply to a wide variety of other animals, monkeys are simply referred to by the words male and female.
Like adult monkeys, young monkeys do not have a distinctive word that applies to them. Immature monkeys are called infants. This term applies to any immature monkey regardless of its gender. Special terminology, however, does exist for monkeys collectively. A group of monkeys is typically referred to as a troop, but the term barrel is also correct, according to the United States Geological Survey. The terms tribe and cartload are sometimes used for monkeys collectively as well.