I don't see why not, warm it gently and pour into ice cube trays, if you find it crystalises and separates just pop a cube of it into a ramekin and reheat it briefly in the microwave, stir and it should be useable again.
I was thinking, 'why would you need to freeze jam', until I realised it wasn't your own home-made. I buy in my Mum's fave brand of marmalade when she visits and that goes mouldy too, I reckon it's the way it is made using gelling agents to save on fruit and sugar costs a bit.