Two of the figures, in action (hard to tell, they move slow). The skeleton rings his bell and tips his hourglass.
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These and the other two figures make up what evidently were the four big fears of old: Death! Vanity! The Turk! The Jew!
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The figures all had to be recarved after the war, since the Nazis tried to burn down the building during Prague's liberation. The Jew was redone with his moneybag, but without his beard- which seems to have turned that figure into: generic Greed! Evidently The Turk couldn't be (or at least wasn't) turned into some other deadly sin (suggestion: Lutes!). Or maybe it's not intended to be a Turk at all, and the four evils are really Vanity, Greed, Sloth, and Death...