"Birthday cake made of fruit" No. Not a cake. Just a big slice of watermelon with some pretty fruit on it. And if you try to serve this to me as my birthday cake, clearly you are asking to be ridiculed for the rest of your natural life.
A fruit owl! Pretty self-explanatory. Pear slice for the body, kiwi for the eyes, blueberries for the pupils, green grapes for the wings, cherries or red grapes for the feet and eyebrows. Pretzel stick for the stick.