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This link potentially matches multiple versions of "Doppelganger":

• Doppelganger (System Reference Document 5.1)

  CR 3 · Monstrosity (Medium)

• Doppelganger (Monstrous Menagerie)

  CR 3 · Monstrosity (Medium)

• Doppelganger (System Reference Document 5.2)

  CR 3 · Monstrosity (Medium)

• Doppelganger (Black Flag SRD)

  CR 3 · Monstrosity (Medium)