The Tattoo Poo-Chi (タトゥープーチ) was listed under the "Painted Poo-Chis"(ペインティングプーチ) heading in the gallery on Sega Toys' Robo-Chi website. This Poo-Chi isn't confirmed to have been released. Sega Toys' website stated that this Poo-Chi is actually the tropical version of the Tattoo Poo-Chi, however, no other versions of the Tattoo Poo-Chi can be found on Sega's website.
This Poo-Chi's primary color for its head, muzzle, legs, and body is orange, and these parts of Poo-Chi have yellow leaves (from a tropical plant, I guess) painted on. The ears and leg caps are orange and translucent, and while the tail isn't in view in the above photo, the same could probably be said about the tail's color, since the tail color normally matches the ear color.
Around its right leg, Poo-Chi has a bracelet with some brown, yellow, and white plastic beads.