Hi, I have a two year old, and he loves nuts & seeds. I usually give him sliced almonds, or blanched & slivered almonds, or just one at a time (pistachios) or cut up small enough that he won't choke on them, & supervise the eating. He has 2 sets of molars, so I feel safe that he can chew them well, but he still needs monitoring that he doesn't take too much in his mouth at once. It's easy for kids to put too much in their mouth & not chew well, so just watch that.
It's also a good idea to only try one new food at a time, to make sure your child doesn't have an allergic reaction.
You might try pumpkin seeds as well, my son loves them & asks for them regularly. I only give him a handful at a time, or a small bowl. They are less of a choking risk, and even tho he doesn't chew them all completely (evidenced by his poop), he gets most of them, and they make a healthy snack. (They also help kill parasites, & even tho you might not think about this it's good to de-worm kids once in a while.)