The BoardGame Zone has a new Kickstarter project going on for Ice Dice. They aren’t made out of ice, these obsidian dice will keep your drink cold without diluting it. They are best for whiskey, you shouldn’t let that stop you from using these in other drinks.
Since these are also D20s though, you could still use these to play your favorite ttrpg. There are two separate decals you can choose from, Ice Dragon or Lich King. These would make an amazing gift for the ttrpg player in your life who also likes their drinks. You can check out their full Kickstarter through February 19.