"Reindeer cookies" are cookies that are shaped like reindeer, which are special animals that pull Santa's sleigh during Christmas time. Full definition
I saw this picture of reindeer cookies on a random Tumblr page and thought they looked like something that would be fun to make with kids or to serve at a children's holiday party. (thefashionablehousewife.com)
We bought, and decorated the Christmas tree, we made cute little reindeer cookies with my little daughter (she made them all by herself, and I was mostly on standby), and we watched Christmas Story, while sipping white hot chocolate from huge, red, Christmas cups. (viktoriastable.com)