They’re often called brown dwarf “stars”, but they’re really like the article says, a gray area between planets and stars. A large brown dwarf can probably look very much like a star. At about 75 to 80 Jupiter mass actual hydrogen (proton-proton) fusion kicks in and it becomes a red dwarf. A full-fledged star.
If they aren’t as big as “real” stars, maybe they should be called “startles.”