Not really.. when in a conversation either one can be used as both of the means the same thing, take for example.. I speak english frequently VS I speak english often You dont have to complicate things.. it means the same thing most of the time Cheers

Thank you!

I found these explanations, maybe they're helpful for you: http://english.stackexchange.com/questions/3637/is-there-any-difference-between-often-and-frequently#3658