I agree it's not always necessary, but the ridged ones have been called "Warriors" reasonably consistently dating back to 1991, I remember seeing old model kits that called them that. The "drone" moniker has been somewhat less consistent, but they've been called "drones" in most modern media and merchandise.
Whether it's "canon" that there's a caste distinction (regardless of the specific words you use to label them) kind of depends on what you consider canon of course.
Edit--
I did a little digging and learned that the 1994 AvP Capcom arcade game called them Warriors (ridged) and Stalkers (smooth).