The terms "buck" and "penny" are both slang terms for money, but they have different origins and aren't directly related. Let's explore the origins of these terms:

Buck: The term "buck" has a long and interesting history. It originated in the 18th century in North America and was used to refer to a deerskin or buckskin. Buckskin was a common medium of exchange among Native American tribes and early European settlers in North America. These skins were often used as a form of currency for trading goods.

Over time, the term "buck" began to be used more broadly to represent a dollar. This transition is somewhat symbolic, as a dollar bill, when it was first introduced in the United States, often featured illustrations of deer or antelopes, further connecting the word "buck" to money. The use of "buck" to mean a dollar has persisted over the years, and it is now a common slang term for money in general.
It's worth noting that "bucks" can also refer to larger amounts of money, not just one dollar.

Penny: The term "penny" is more straightforward. It comes from the Old English word "penig," which referred to a small coin. In fact, the English currency used to include coins with names like "penny," "shilling," and "pound." The term "penny" has been in use for centuries to describe the smallest unit of currency in various monetary systems.

In summary, "buck" and "penny" have different origins and do not directly relate to each other. "Buck" is a North American slang term for money that likely evolved from the use of buckskins as a form of currency among Native Americans and early settlers, while "penny" has its roots in the Old English word "penig" and has been used for small coins for a long time. Both terms are still used today to refer to money in everyday language.