Many animals feature round noses. Here are a few notable examples:
Mammals
Pigs: Their iconic snouts are famously round.
Pugs: These dogs are known for flat, wrinkly faces that include a round nose.
Bears: While not perfectly round, their noses are large and rounded.
Elephants: Their trunks have a round tip used for smelling and manipulating objects.
Other Animals
Frogs: Many frog species have round noses.
Some Fish: Fish like the pufferfish have round noses that can inflate for defense.
To give you a more specific answer, it helps to know more about the animal you have in mind. What other characteristics does it have? Is it big or small? Does it live on land or in water?