Lila Wayne Yup, there are a couple of crossovers. Wendy and Loki appear for a chapter, Ember Holmes is like one of the main characters here, Finn and Annali also appear, and Tove and markis Bain are present there.
Alyssa There is crossover from the Trylle trilogy (Switched, Torn, Ascend). Finn is present in Frostfire (his sister Ember is a very important character in the novel). Tove is also present. I *believe* the Kanin Chronicles occurs several years after the Trylle trilogy ends, but I'm not 100% certain. Finn is 24 years old in Frostfire. So, yes, there is crossover, both in characters and story!