The story of Phaya Khan Khak is a toad tale from the Northeast region of Thailand, intertwined with the legend of the Phaya Nakh rocket. The name "Khan Khak" originates from the Lao region and both sides of the Mekong River, whereas the Thai term for the Chao Phraya River basin in the central region is "Khang Khok". It narrates the saga of the eastern region, chronicled on a palm leaf in Thai Noi script, depicting Phaya Khan Khak's struggle against Phaya Than to beseech for seasonal rainfall.