I think it is possible, but you will have problems with tissue adherence to the glass slide. If the tissue is still in ethanol, I would immerse a 1x1x0,5 cm piece in liquid OCT for an hour at RT. And then freeze it in the cryostat. use adhesive slides, maybe airdrying after sectioning for a better adherence.
If this is about EM please think about cryoFIB s an alternative, even smart focused fibbing is possible if correlative microscopy is of interest. Thomas