A skiff is a somewhat small ship with above average speed. It can fit more than a Dinghy.

(Picture is for reference only. It does not have to look like that.)

Minimum Block Count: 40
Maximum Block Count: 60
Minimum Percentage of Wood Planks/Slabs/Stairs/Trapdoors/Fences/Logs (Hull): 30%
Minimum Percentage of Wool/Banners (Sail): 30%
Maximum Number of Chests: 2
Blocks skipped when cruising: 4
Speed: 1.0