Boiled marshmallow frosting recipe...?

The recipe I have calls for cream of tartar and light corn syrup (no marshmallows). It's not easy to find corn syrup where I am. Can I substitute it with a generic pancake syrup? I'm guessing it won't make much of a difference in the flavor. I'm just worried it will affect the consistency and volume. The pancake syrup I have is not as dense and thick as corn syrup. Thanks.