Frederika rhymes with:
fredericka, fredericka, fredericka, fredericka, fredericka, alarica, chandrika, costa_rica, enrica, eureka, farica, fredericka, paprika, rica, ricca
Frederika sounds like:
fortier's, fortress, fortresses, forwarders, frederic, frederica, frederick, frederick's, fredericka, fredericks, frederico, fredric, fredrich, fredrick, fredricks, fridrich, friederich, friederike, friedrich, friedrichs, friedrick, furthers