Excellent question! There's no definitive way of saying "this is a fossil"; so paleontologists usually pick the arbitary age of 10,000 years - so if remains are more than 10,000 years old, they are...
in rivet ravine
Any fossil can be a frozen fossil, a frozen fossil isn't a type of fossil. It's just a natural occurance to a fossil.
Because they are made of fosils
no