Ok, so here are all the children I came up with for the HTTYD characters. Just to make it clear none of this is Canon.
Stoick "Kerr" Haddock - Hiccup and Astrid's kid.
Mead Ingerman - Fishlegs and Ruffnut's daughter.
Fishlegs Jr. "Fishy" Ingerman - Fishlegs and Ruffnut's son.
Rutt (short haired twin) and Dune (long haired twin) Thorston - Tuffnut's kids.
Staglout Jorgenson - Snotlout's Son.
Trout Jorgenson - Snotlout's daughter.
Art © me
No one has permission to use.