Add the cooked chicken, celery, grapes and green onions in a large bowl. Toss to collect. Set the bowl aside.
In a small bowl add mayonnaise, sour cream, chopped dill, pepper, salt and lemon juice. Whisk together until combined. Pour the sauce over the chicken mixture. Stir until combined.
Cover and place in the refrigerator for at least 4 to 6 hours or overnight.
Cut each croissant roll in half. Spread half a cup of chicken salad on the bottom half. Put the other half on top.
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