I discovered this today. You will be taking the chance of getting fined for US$ 2500 for EACH egg you bring into the USA. What a nice surprise that would be??

Kinder Chocolate Eggs are Prohibited
Kinder chocolate eggs are prohibited as an export to the U.S. because the toy surprise hidden inside poses a choking and aspiration hazard in children younger than three years of age. The Kinder eggs are hollow milk chocolate eggs about the size of a large hen’s egg and are usually packaged in a colorful foil wrapper. The toy within the egg is contained in an oval-shaped plastic capsule and has small parts that require assembly. Each egg contains a different toy.
The U.S. Consumer Product Safety Commission (CPSC) has determined that this product fails to meet small parts requirements for children less than three years of age. Additional information regarding unsafe toys and product recall announcements can be found at the CPSC website. U.S. Customs and Border Protection (CBP) and the CPSC work jointly to ensure the safety of imported goods by examining, sampling and testing products that may present substantial hazards.