Here are some possible English translations, depending on the context:
* Rice flour fritter: This is a general term that accurately describes the main ingredient and preparation method.
* Savoury rice doughnut: This emphasizes the shape and flavor profile of the snack.
* Olaichuvadi: You could also simply use the Tamil name, especially if you're talking to someone familiar with South Indian cuisine.
Ultimately, the best translation depends on the specific situation and the level of detail you want to convey.