Just Google their name with "Nasuverse" after it and if it comes up with a Wiki Link for that Servant then there probably is.
From personal Search: those two don't exist.
Although a USA Hero would be much more stronger Summoned in the USA (example: Vladimir Tepes of Wallachia in Romania being pretty much unbeatable). No clue if Tesla would count though. Also their reputation governs their power and strength (Example: Vladimir hates Bram Stoker and can turn into a vampire). Best way to deal with Servants native to USA is launching them 3,000 miles out to sea so the international boundaries lock them out and then nuke them on high and hope they don't swim back. Alternatively launch them into the stratosphere and turn them into a fine mist before they come back to the troposphere. Final choice is to get them onto a Territory of a Servant (BB thusfar is the only one who can do this for some reason). Although I do have to wonder if a USA Hero getting closer to their state of origin would make them stronger... LETS SUMMON A FOREIGNER CLASS (probably Abigale or Lavinia, pretty sure Brockton is in Massachusetts since it's near Boston so... Yeah, in the same State of Salem) AND FIND OUT!