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two faced hiding
duo aperta

ogre-faced spider
dinopis

angel faced devil
diabolus olim angelus

yellow-faced siskin
carduelis yarrellii

dog-faced water snake
cerberus rhynchops

white-faced whistling-duck
dendrocygna viduata

pied tamarin bare-faced tamarin
saguinus bicolor

bifaciatus, bifaciata, bifaciatum two-faced; two-sided, having two sides;
bifaciata

biformis, biformis, biforme of double form, two formed; consisting of two parts/forms; two-faced (janus);
biforme

bifrons, (gen.), bifrontis two-faced, with/having two faces; having two foreheads; having two sides;
bifrons