Ranger: When you’re only going to have the ability to bump one of several ranger’s two major attributes (Dexterity and Knowledge), you still make for a fantastic scout, hunter, or bounty droid (see episode one of many MandalorianKnight (Player’s Handbook): An interesting take on a Firbolg background might be granting them knighthood, as this

Speaking to vegetation is much more challenging. Without magic, most mundane plants are inanimate and don’t have senses like humanoids do. Your DM may allow mundane crops to answer really straightforward commands, like asking a venus fly trap to open or shut, but something beyond the plant’s regular capabilities would require magic no matter ho