what bodyweight exercises are best for building traps? thanks

You know how to shrug right?

get upside down and shrug, you'll be shrugging almost all your weight that way. Find monkey bars, hang from them, bring your legs up and into the monkey bar hole and with your arms straight start shrugging.

Now ask yourself... why do you want bigger traps hahahaha make sure your body is proportionate dog you dont wanna look ridiculous... but yeah that exercise should work. Handstand push-ups might too.

your traps work mostly when ure pulling and when ure doing hspu as stated. its a compound muscle and a stabilizer muscle. dont worry, ure working it fine probably.
oh and yeah upside down shrugs are quite specific to that area

Yeah my traps have gotten bigger from doing lots of handstand pushups. Don't worry too much about it worry about progressing to harder moves and if you're not growing you may need to eat more.

show me support and i show you the best calisthenics superset for traps