What is the male form of a tabby?

The term "tabby" refers to a certain coat pattern which is found on many different breeds of cat, and can be found on both male and female cats.

A tabby is a cat with a distinctive coat that features stripes, dots, or swirling patterns, usually together with an "M" mark on its forehead. The pattern occurs both with sexes and is not a specific...

On the contrary - the Tabby pattern is probably the most common seen on cats, both male and female.

Yes, I have personally had female orange tabby cats.

They can be male or female. ADD: The term "Tabby" is actually a common coat colour. A Tabby cat isn't a breed, although the common "moggy" is sometimes called a "Tabby cat".