Monotremes
a group of platypus is called a 'businesss'
The platypus's family group is Ornithorhynchidae.
unfortunately, you misspelled platypus. it is a common mistake though. more than one platypus are platypi.
The mammal group to which the platypus belong is monotremata.There are only two animals in that group: the platypus and the echidna, and they are known as monotremes.
The platypus is a mammal, specifically a monotreme.
The platypus should not be called anything else. It is just a platypus. It is not a duckbilled platypus, or any other such misnomer.
Monotremes
You're thinking of the platypus, which lays eggs and can eject venom. But the platypus isn't a marsupial. No marsupial lays eggs or is venomous. The platypus is part of a small group called the Monotremes.
The platypus is classified as a mammal. It has all the defining characteristics of a mammal, including the ability to nurture its young on mothers' milk. It is a monotreme, of the order monotremata, meaning it is an egg-laying mammal.
From the time a platypus is hatched, it is called a platypus. It makes no difference whether the platypus is a day old, 17 weeks old or a year old. It is still a platypus. There is no official name for a young platypus. Despite what many websites report, a young platypus is not called a puggle.
The platypus is called the platypus wherever one happens to be in Australia.
If you mean genus, e.g. Canines, Felines, etc., then platapusses and echidnas are marsupials