Anurognathids seem to have been really weird, even in pterosaur standards. They had a round, frog-like head with sharp teeth and huge eyes. Their heads seem to have been covered in pterofuzz all the way to the snout, and had some longer, whisker-like fibers.
Even weirder, the edges of their wing membranes were hairy, similar to the combs found in owl wing feathers ([link]
). This is the mechanism that lets owls fly silently. Anurognathids seem to have had a silent flight too.
This critter was drawn as a small sketch without references. Sorry for the anatomical inaccuracy.