The Sylkins are a tribe of forest-dwelling Teensies. They are encountered in several levels in Rayman 3, including the Gameboy Advance adaptation, where they are shown at the end of every world with two Nookins.

A Sylkin in Clearleaf Forest

The following text comes from the official Rayman 3 website:

The Sylkins are the Teensie forest dwellers, shepherding the giant Bonton creatures for wool and milk. After the work is done, there's nothing left for these funky folk to do but dance!