This is an egg laid by a grue. You're assuming a grue will hatch from it.
(In-game plural: grue eggs)
- Strange Leaflet Quest
|You put the grue egg in your Familiar-Gro™ Terrarium.|
|It hatches, looks up at you with its cute little eyes, and murmurs "Momma?"|
|You decide to name him Frolliam.|
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