If your ankle is still injured, rest and stretching is the only thing that's gonna help. You exercise it when it's healed or almost healed. If it still hurts, it's probably not healed and you're just gonna make it worse.
If you've been cleared I guess calf raises would be good for the flex part. I've never had an ankle injury during the ski season so I'm not sure if wrapping it under your boot would help or make it worse.... Just don't be dumb dude. You don't wanna make it worse than it already is.
If you french fry when you should pizza, you're gonna have a bad time. - Thumper
"You don't wanna be a boner when you land" - LJ