In Finn Family Moomintroll, Hemulen steals their barometer, and this causes them to relentlessly pursue him until they get it back.
The house is described and depicted in many of the books and comics about the Moomins and Tove Jansson even drew blueprints of it as an illustration for Finn Family Moomintroll.
Both the Snork and Snork Maiden also appear, living with the Moomins, in the following book, Finn Family Moomintroll, but are not mentioned in The Exploits of Moominpappa, the events of which are solely related to Moomintroll, Snufkin and Sniff.
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All Snorks change colour with their moods, although this is only mentioned in two books, Comet in Moominland and (very briefly) Finn Family Moomintroll.
Finn Family Moomintroll - This is the first appearance of the Groke, and she is generally played as a frightening villain, though Sniff expresses a bit of sympathy for her, at one point moving himself to tears with a speech on how awful it must be to be so alone.
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