No, the toggle on the breaker frame cannot be replaced as the toggle is integral to the breaker frame.
The breaker frame needs to be replaced.
However, the toggle extension (4 to 5 cm long piece screwed to the toggle) can be replaced, but only if the toggle thread is not damaged.
If the thread is damaged the breaker frame needs to be replaced.
For the NSX up to 250A - Part number is LV429313
For the NSX 400A to 630A - Part number is LV432553