hey.
Any non toxic plant is ok, however some plants that arent toxic to beardies, are to iguanas etc so ive had troubles being 100% sure.
[gyraniums most recently suprised me as they are a no no for beardies but on the safe list for iggys]
But i know there are lists out there and some that are ok are
Dracaenas
ficus
spider plants
lavender
i will try find a decent list.
your beardies may very well eat them though yes.