Trioceros fuelleborni, also known commonly as the flapjack chameleon, the Ngosi Volcano chameleon, and the Poroto three-horned chameleon, is a species of lizard in the family Chamaeleonidae.

[2] The specific name, fuelleborni, is in honor of Prussian-born physician Friedrich Fülleborn, who worked in Tanganyika (now Tanzania) from 1896 to 1900.

[3] T. fuelleborni is found in southwestern Tanzania in the Poroto Mountains and on volcanoes of the Rungwe Volcanic Province.

[1][2] The preferred natural habitat of T. fuelleborni is forest, at altitudes of 2,200–2,500 m (7,200–8,200 ft), but it has also been found in trees and bushes in suburban areas near forest.

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