Welcome to BYC! Please make yourself at home and we are here to help.
Oh yes!! You can give them kitchen scraps. Stay away from the following though:
Alcohol
Moldy Foods
Anything Salty
Asparagus-This will change the flavor of a hen’s egg to a bad taste but it otherwise is not harmful.
Avocado-Avocado has a fatty acid in it called “persin” which sadly can be fatal to chickens and sometimes other birds.
Green Areas of Potatoes, Peels and Potato Sprouts-All are poisonous to chickens and you personally shouldn’t eat them either!
Herbs and Plants to Stay Away from-Azalea, philodendron, rhododendron, sweet pea, black nightshade, foxglove, oleander, castor bean, vetch, henbane, irises, lantana, St. john's wort, trumpets vine, morning glory, datura, clematis and honeysuckle. If any of the herbs you are wondering about are not listed in this book, look them up before giving to your flock.
Leaves from Tomato, Pepper, Potato, Eggplant or Nightshade Plants
Onions-Onions contain a substance called “thiosulphate” which will kill red blood cells, cause anemia and sometimes even result in death.
Potatoes-Surprisingly, potatoes contain solanine which causes diarrhea, heart failure and kills red blood cells. However, sweet potatoes
do not contain this substance and are perfectly fine and dandy to feed to your flock. Sweet potato fries are also fine as long as they aren’t salted.
Processed Foods and Sweets
Raw, Dry Beans
Raw Peanuts and Other Nuts
Rhubarb leaves-Rhubarb leaves surprisingly contain oxalic acid which is poisonous to chickens.
Tobacco
Really anything else can be given as a treat. Treats are only supposed to take up 10% of their daily diet though.
https://www.backyardchickens.com/a/chicken-treat-chart-the-best-treats-for-backyard-chickens
Good luck with your flock and we are here to help.
and Welcome To BYC! Mountain Peeps gave you some good suggestions, there is also a treat chart in the Learning Center 
