Are tribunals constitutional bodies?

Tribunals are not constitutional bodies. In 1976, Articles 323A and 323B were inserted in the Constitution of India through the 42nd Amendment. Article 323A empowered Parliament to constitute administrative Tribunals (both at central and state level) for adjudication of matters related to recruitment and conditions of service of public servants. Article 323B specified certain subjects (such as taxation and land reforms) for which Parliament or state legislatures may constitute tribunals by enacting a law. 

Further Reading:

• Tribunals in India
• Tribunal Reforms Act, 2021