The short answer
Yes — fresh or thawed peas are a nutritious favourite.
Why
Peas pack protein, vitamins and fibre into a perfect budgie-sized package, and most birds love them. There's no need to cook them — fresh or frozen-then-thawed both work.
How to feed it
Offer a few peas whole or lightly mashed; thaw frozen ones and let them reach room temperature first.
How much & how often
Frequent is fine.