Mounting Frogspawn

[Oscar]

I have this frogspawn simply embeded in the sandbed. You cannot really see it in this photo but the two heads are on two stalks.

I only have a small amount of sand exposed at this time and I would like to move this frag up onto the LR. Can I cut the two heads off and mount them on the LR? Will each head expand on the rock or will they continue to grow by extending their stalks?