The scientific name for Sage is Salvia officinalis and it is a herb that is also known as common sage, garden sage or culinary sage.
It is a perennial, evergreen subshrub, with grayish leaves, woody stems and purple and bluish flowers [Source: Wikipedia].
So can chinchillas eat sage?
No, they cannot eat it at all.
Sage is rich in fats, calcium, acids and proteins.
If a chinchilla eats sage in a larger amount it could cause nervous system issues. Additionally it could affect the kidney and cause seizures.
Make sure you avoid trying to feed this herb to your chinchilla as it is not good for their health.