Frozen water pipes or clogged pipe?

I live in a trailer, in one of the bathrooms the toilet and bathtub across from it hold water. It's been like this for 3 days now. I've use the blow dryer and I even took off the toile and replaced the wax seal cause that was leaking. I've poured boiling water and salt down both the toilet and bath tub... show more I live in a trailer, in one of the bathrooms the toilet and bathtub across from it hold water. It's been like this for 3 days now. I've use the blow dryer and I even took off the toile and replaced the wax seal cause that was leaking. I've poured boiling water and salt down both the toilet and bath tub drains. What's wierd is that all the pipe work in the house but whatever pipe connects those to two things. When I try and plunge the toilet all the water flows the the drain and into the bath tub like wise when I try to plunge the bath tub drain. I'm so confuse at weither or not its a frozen pipe or just a clogged pipe between the bathtub and the toilet. Help!
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