Suspended animation

Suspended animation is a condition in which a person or living creature is put into a form of stasis, slowing down physical functions to keep them preserved and protected for extended periods of time. This usually appears in fictional works where characters are kept in an ageless or slowly-aging state through the passage of time.

Mainstream Smurfs Media
Suspended animation is used a few times in mainstream Smurfs media. In one episode in the cartoon show, "Spelunking Smurfs", an ogre that stole the Smurfs' food as well as a magical diamond was kept frozen in ice until the diamond changed color again, thus freeing him from stasis. In another episode, "The Smurfs That Time Forgot", a baby dinosaur was freed from being frozen in ice when the Smurfs encountered him on top of a snowy mountain.

Empath: The Luckiest Smurf stories
In the EMPATH: The Luckiest Smurf story series, Sassette was a real female Smurf that was put into suspended animation inside a magical crystal by Avengelica the female wraith until she was discovered by Miner Smurf and freed from her prison by the Smurflings. Since during her time in stasis she forgot her actual prior history with her fellow Smurfs at the time, she was adopted as one of the four Smurflings and was given the false history of being a magically-created female Smurf so she could bond with Smurfette.