Crystal Wollywog

The Crystal Wollywog is an unused species of Amphituber from Pikmin 3. It appears just like a standard Wollywog with a rock-like object underneath its stomach. This is believed to be the replacement for the Wollywog prior to the final release.

In Pikmin Eco
The Crystal Wollywog is a Amphituber that appears in Pikmin Eco as a replacement for the Wollywog. Unlike the unused creature from Pikmin 3, the Crystal Wollywog in Pikmin Eco has an actual crystalline stomach instead of a rocky object.

They behave similarly to the Yellow Wollywogs; they remain stationary until the player ventures within range. Once they do, they will leap up into the air and slam down on top of either the player or their Pikmin, crushing any underneath. Compared to the Yellow Wollywog, the Crystal Wollywog has a longer range, and can cause more damage to the player thanks to the crystalline stomach.