The thing about being brave is you sometimes don’t know you’re doing it.
It can take on many forms. Bravery can be distracting a bunch of orcs so your friend can escape with the Ring. Bravery can be choosing to hang around and be friends with werewolves even though they could seriously hurt you without meaning to, and taking part in the adventures with nothing but your wit and courage. Bravery can be facing down a large dragon who could easily obliterate you with one breath.
Merry and Pippin, Stiles and Bilbo were brave. And I don’t think they even knew it.