What is a jackleg?

A "jackleg" typically refers to a person who is considered unskilled or inexperienced in a particular trade or profession, often taking on tasks without proper training. The term can also describe someone who is a fraud or pretender, especially in a professional context. Additionally, in some regions, it can refer to a makeshift or improvised approach to a task. Overall, it conveys a sense of ineptitude or lack of professionalism.