Sure, they fake all sorts. Krugerrands are some of the most popular bullion coins. The fake ones are usually plated with pure gold, which is a very soft malleable material and can be rolled extremely thin. Real krugerrands are alloyed with copper to make them more durable. The copper also gives them a different colour, so fake coins usually stand out like a sore thumb. But you can do basic checks such as measuring and weighing them to verify they are genuine. But a good way to test them is to download a bullion pinger app. Search the android app store for "Bullion Test Free". Basically you can tap the coins, and they'll ring like a bell with a very specific note. Plated coins will ring with a different frequency.