Sure. And there are literally hundreds of VOIP alternatives to Skype that can make those calls. A 30 second or less Google search will list the top choices with a breakdown of each. 10 seconds using AI search. Skype hasn't been the only game in town for a long time now. Posting on FB, waiting, and then sifting through dozens, if not hundreds of opinion replies is like searching for answers on dial-up BBS's.
At which land crossings? I'm planning on crossing the friendship bridge and to Vientiane, staying 7-12 days, then returning for another 60+30. It will be my first time exiting and returning after my initial 60+30. Never been to Thailand prior.
After that 90, I was planning to return to the US for 6-8 weeks, then probably do Vietnam, Cambodia, etc... for a few months before attempting to re-enter Thailand, probably on a different visa by then.