I wonder if we can have training for variants too here.

We are planning to do that, yes! We're working towards the integration of a draughts computer in the same way as on lichess. This will also be used to generate puzzles from the games played on lidraughts, so there is nothing in principle that stops us from doing that with frisian draughts (or other future variants) as well.

We have close contacts with the ambassadors of the Frisian Draughts Association (FDA) (http://www.friesdammen.nl/uk/friesdammen).
Hopefully this will lead to tons of study material and other stuff.

An interesting fact to know is that Frisian draughts was founded in the 18th century. The 10x10 draughts variant, more prominent and well known in this time of age, is actually originated from Frisian draughts.

@Finlip: Note that it is allready possible to make your own studies for Frisian draughts.

@BumperBalloonCars Thanks, I'm aware of that having made Antichess studies on lichess and confident it must be same here with variants. Yes study no puzzles.