CT^3CT^3 means Claus Triple Cheese Three Colour Tetra which perfectly describes inventor, shape, colors and underlying mechanism.
Danger CubeNot the first Square-1 in shape of a tetrahedron but this is a pillowed tetrahedron and it was made by truncating only.
Dino TetrahedronA Rainbow Cube covered with sheets of plastic to give it the shape of a tetrahedron.
Duo PyramidA cubic 3x3x5 scrambled, axised and transformed into tetrahedral shape.
DuomoA Halpern-Meier-Tetrahedron with a strange cutting pattern.
ElemorphixThis is a sticker mod for the Mastermorphix puzzle with 3 possible solutions