It is stated that Finrod Felagund was able to quickly master Taliska purely by determining the various changes undergone by its Avarin component from Primitive Quendian, and Faramir stated that all languages of Men are of Elvish descent, suggesting that Taliska and Adûnaic are in fact Quendian/Avarin with some Khuzdul influence (notwithstanding the possibility that Faramir was misinformed, much as how many people mistakenly think English is a Romance language).
Finduilas lived in Nargothrond with her father Orodreth under the rule of Finrod Felagund.