Yes — radishes and their leafy tops are safe and nutritious. The peppery bite divides birds, but it's harmless.
Keeper's noteOffer thin slices and the leafy tops — the greens are often more popular than the root. Grate for small species.
Why radish is good for parrots
Radishes are non-toxic, low-calorie, and bring vitamin C, while the green tops are a nutritious leafy vegetable. The mustard-oil compounds that make radishes peppery are harmless to birds, though some will refuse the spicy root and prefer the milder leaves.