Oh, if you are a freshman you can do anything that fancies your interest. Again, GPA is king so drop everything else if you have to, especially for freshman year.
Whether something is an internship or not doesn’t change anything, it’s what you get out of it that matters. That said, it might be difficult to secure a good one this early on so I wouldn’t be too sad if it doesn’t pan out... Plenty of chances ahead, and you can get an equal or even superior experience by just doing research under a professor at your university.