Prayag Dutta Joshi was the first person to declare the language of western Orissa as an independent language and named it as "Kosli", and declared that:
"ପୁନଃ ପୁନଃ ଘୋସୟାମୀ ପ୍ରସୃନ୍ବନ୍ତୁ ମନିସିଣଃ
ସ୍ଵତନ୍ତ୍ର
— କୋସଲୀ ଭାସା ନୋପ ଭାସା କଦାଚନ"
(Punah punar ghosayami Prasrunwantu manishina, Swatantraa Kosli bhasa, Nopa bhasa kadachana).
"Kutek lokar gutek Bhasa
Kosli amar Matru Bhasa"was his words that impress the mass to run the Kosli Bhasa Andolan.
He is popularly known as 'Kosli bhashar Janak' (Father of Kosli Language) and also as 'Kosal Gaurav'and "KOSAL RATNA".
He also spearheaded the Kosli language movement. Some of his books and articles are:
- Kosli Bhasa ra Ghara Samparkiya Sabdabali - Girijhar Bhawanipatna, November 1984.
- Paschim Odisha ra Bhasa Kosli - Hirakhand Basant Milan Souvenir, January 1985.
- Aaji O Kali ra Oriya Bhasa -Dainik Hirakhand, 1 February 1985.
- Kosli Lok Sahitya Re Rititatwa - Presented at Purbanchaliya Ritisahitya held at Panchayat College Bargarh and published in the souvenir, 25, 26, 27 November 1985.
- Kosal Pradesh ra Maitri Nibandhan - Odisha Sanskrutik Samaj Jayanti Samaroh Souvenir, 1986.
- Swatantra Kosli Bhasa - Dhuan Aru Dhuka - Saptarshi, July 1986.
- Swatantra Kosli Bhasa - Bidwatbimoha - Saptarshi July 1987.
- Swatantra Kosli Bhasa ra Parichay - Saptarshi, March 1988.
A well-known name in Kosli language, literature and movement, he was the first serious scholar who attempted a linguistic study of Kosli language. In fact, it was Joshi, who so emphatically announced that the language of the region was not Odia, but Kosli. Till his death he was not only producing seminal essays on uniqueness of Kosli Bhasa and literature but also promoted many amateur Kosli writers and poets. He was also among those who for the first time in 1986, submitted a memorandum to the President of India to include Kosli under Eighth Schedule. His small booklet Koshali Bhasar Samkhipta Parichay is considered as a sacred text by Kosli writers as well as leaders of the Kosal movement.
Achievements
He was felicitated by following organizations:
1979 - Khadial Sahitya Samiti
1980 - Panchapakhuda, Bhawanipatna
1984 - Mahavir Sanskrutik Anusthan, Bhawanipatna
1985 - Hirakhand Basant Milan Samaroh
1986 - Odisha Lekhak Sammukya
1987 - Jadumani Sahitya Sansad, Udaypur, Puri
1988 - Samalpuri Lekhak Sangha
1989 - Orissa Sahitya Academy.