Ok, I will now study about testnet and it's whereabouts.
If you are really intetested in learning more about testnet, I suggest you start with this topic:
https://bitcointalk.org/index.php?topic=5215716.0it explains in details how to switch to the test network on both bitcoin core and electrum.
I could experiment with giving them small amounts of eth, or some token too for a matter of fact. But it will distract their thoughts about bitcoin and will make them think about this and not bitcoin.
Besides distracting them, it may create some confusion as ethereum doesn't work the same way as bitcoin. Also, eth transaction fees are too high right now.