Sherbet, also called Sherbert or Soda powder, is a fizzy, sweet powdered sugar, usually eaten by dipping a lollipop or liquorice stick, using a small spoon, or licking it from a finger.
Pixy Stix
…Tangerine Twist Sherbet – a fizzy powder similar to that found in Pixy Stix Ronald Clark O'Bryan – a man who killed his son using a poisoned Pixy Stix…
Jars of colourful sherbet powder in a sweet shop
German Brausepulver is similar, and while originally sold as such is often not mixed with water nowadays but eaten by children by dipping a wet finger into it, or by adults in combination with vodka.