Can ferrocene type sandwich compounds be made with fluorene?
Yes there are, many in fact.  One of the examples is having a complex consisting of a fluorene molecule and of cp altogether with iron, described by Decken in Acta Cryst. E (doi: 10.1107/S1600536804028077):



(source)

You are not limited to complexation with iron, though.  Already by the title «Synthesis and characterisation of Ti, Cr, Mo and W bis(fluorene) complexes» by Cloke et al. in J. Organomet. Chem. (source, paywall) you may see that there is a lot of variation possible by either varying the metal, or the second molecule to build the complex.