So do I have to worry about these little roots

Hard to say. If you want to carefully dig them up and have a look; then replant, that's fine.

If, when doing so, you find the beginnings of fronds that may be pointed sideways (or even upside down), reposition the plant a bit to help it along.

Sometimes I like to presprout dormants before putting them out in the garden by potting them up in good potting soil, then placing them inside by a sunny window until the first few fronds have unfurled. Soil is kept evenly moist, not soggy until this happens.

I have lots of perennial ferns planted throughout my yard. Several cinnamon stick ferns that I have had for probably about 7 or 8 years. I have a total of about eight planted in an area. Today I am inspecting everything and I only notice about four of them coming up. No signs of the others at all. My question is, is there something that would eat them during the winter months,they were there until frost, and have always come up. I have a problem with either voles or moles, or both could this be a problem with them ?