Croc 2 Demos
This page is a list of all demos of Croc 2.
PS1 Demo

The only level included is Find the Key! Save the Gobbo!, but the disc contains earlier versions of several levels that cannot be played, even through hacking.
It came packaged in a cardboard slip.
Official PlayStation Magazine
A bit further ahead, this version appears to have only a handful of minor differences, and much of the level is close to how it appears in the final. Likewise, the title screen is also identical to the final game, although it lacks some of the usual options that the main game includes (such as saving and loading).
PC Demo
This is a very late demo, with very few actual differences between both levels. It was released with certain PC copies of Croc: Legend of the Gobbos and was also available on the Argonaut website.
Japanese Demo

It is currently undumped, and may possibly be the rarest of the Croc 2 demos. It was shipped in a similar sleeve to the PS1 demo, although it lacks any color.