reddish leathery leaves
 

I got these tiny little dendrobium keikis so I was like, Yay!!! and then some mold started growing on the roots somehow, so I cut off the bad parts and stuck the plant in the fridge. Then I forgot it and like four days later, I got it out. The leaves were a teeny bit leathery. It's getting worse and worse and the leaves are starting to turn reddish. :(
Also I have another one(both D. kingianum) and they both don't have many leaves. The dying one has 3 and the healthy one 2. They don't really grow. ?

Many dendrobiums lose their leaves in the winter.

I almost certainly cannot explain what's going on, since I'm a newb, but I suspect that information about what kind of Dendrobium it is would be helpful, and possibly some pictures once you have enough posts to post them.

I'm not sure what is going on with your plant. Out of interest why did you stick it in the fridge. Being subjected to cold temperatures and no light will not have helped your plant and it may be stressed, hence the change in the leaves.

Welcome to the Orchid Board.

What do you mean by tiny? Most people don't remove Dendrobium keikis until the roots are a good 2-3 inches / 5-7.5cm long, or longer. Survival is very low before this.

You might want to make five posts (You need to make five posts to post a picture) and add a picture of the orchid in question so we have a better idea of its condition and can help better.
My kingianum has reddish leaves but is pretty happy; it is putting out new growths and roots. Many orchids will get reddish coloring when cold (I have cooler house temperatures). As long as the cane doesn't turn mushy and rot or die, your Dendrobium will recover. Being a kingianum, you have a better chance of it escaping serious harm as they can often take cooler temperatures.
If you can find any seaweed/kelp product (made specifically for plants, preferably rated well), you could soak it for a few hours in that, then pot it up in a looser medium and perhaps a shall or basket-type pot that will allow more air to the roots. This will help prevent future molding issues. To help get the roots growing, keep your little orchids warm (perhaps a seedling heat mat?) and in good light (east or south-facing window). Good luck!