First-born cowboys are not tigers, cold plums proud of snow to leave a fresh scent, guess an animal, come and guess!

The animal described in this sentence is a cow.

Based on the given words "cowboy in its infancy" and "cold plum, proud of snow, leaving a fresh fragrance", we can infer that the animal is a cow. First of all, "newborn cowboy" implies the form of a cow, referring to a calf that has just been born. The phrase "Cold plums standing proudly in the snow" suggests the courage and perseverance of the cow, just like the cold plums standing proudly in the snow in the cold winter, emitting a fresh scent. At the same time, in traditional Chinese culture, oxen are also characterized as hard-working, persevering, stable and cautious, which is consistent with the image of the "newborn cowboy" and the "cold plum standing proudly in the snow and leaving a fresh scent". Therefore, the animal described in this sentence is a cow.