The existence of the ninjato, a specific sword associated with ninja, is a subject of debate and speculation among historians and sword enthusiasts. There is limited historical evidence to support the notion that a distinct and unique sword called the "ninjato" was exclusively used by ninja.

The term "ninjato" itself is a modern term coined in the 20th century, and there is no historical documentation or archaeological evidence that refers to a specific sword known as the ninjato during the time when ninja were active in feudal Japan.

Instead, historical records suggest that ninja, who were covert operatives engaged in espionage and unconventional warfare, likely used a variety of weapons, including regular swords such as the katana or wakizashi, as well as other tools and equipment adapted for their clandestine activities.

The modern depiction of the ninjato in popular culture, with its straight blade, square guard, and association with ninja, is more of a fictional construct that emerged from various media, including movies, novels, and video games.

While historical accounts do not confirm the existence of a specific ninjato sword, it's important to note that ninja were known for their adaptability and ability to use a wide range of weapons, tools, and strategies. They would employ whatever weapons were available and suitable for their missions, which could include swords, staffs, sickles, or even everyday items repurposed as weapons.

Ultimately, the concept of the ninjato as a distinct and standardized sword unique to ninja remains primarily within the realm of popular culture and fiction rather than historical fact.