In Jain usage, “Navanu” usually refers to 99. It is most commonly used in two ways:

1. Navanu Yatra / Navanu Jatra — a devotional Jain practice connected with Shatrunjaya (Palitana), where the devotee performs 99 ascents of the holy hill as an intense form of penance, devotion, and आत्म-शुद्धि (self-purification). ( jainknowledge.com)
2. Navanu as a recitation practice — in some contexts, it means reciting a prayer or mantra 99 times as a form of atonement, devotion, or spiritual discipline. ( jainknowledge.com)

So if by “Navannu Forms” you mean the different forms of Navanu in Jainism, the main forms are:

• Navanu Yatra
• Navanu recitation / japa
• Navanu as a penance or vow-based practice ( jainknowledge.com)

If you want, I can also explain the meaning, विधि (procedure), and spiritual significance of Navanu in simple Jain terms.