There are different kinds of skateboards (e.g. longboards), but as of Unicode 10.0 there is only a surfboard 🏄 and a snowboard 🏂 emoji (plus skis 🎿⛷) as well as an iceskates emoji ⛸, but no board or shoe with wheels (neither 4×1 nor 2×2).

Petitions

• change.org: Skateboard(er)
• change.org: Roller skates

Proposals

• L2/16-378 Skateboarder Emoji proposal
• L2/17-277: Consolidated sports emoji proposals includes Skateboard