Can the hydride ion act as a ligand?
Yes, there are many examples. For instance


The common reducing agents LithAl, $\ce{LiAlH4}$, and sodium borohydride, $\ce{NaBH4}$ (last one you might argue about)
$\ce{[ReH9]^{2-}}$, see https://en.wikipedia.org/wiki/Potassium_nonahydridorhenate
Metal carbonyl hydrides, see https://en.wikipedia.org/wiki/Metal_carbonyl_hydride
More generally many organometallic compunds, e.g. $\ce{(C5H5)_2ReH}$


A quick google also shows up http://www.ilpi.com/organomet/hydride.html