小盆友 is a
谐音 (homophone-play) respelling of
小朋友 that mimics how a young child or cutesy anime character might slightly mispronounce
朋 (péng) as
盆 (pén). Heavy online/cute-speak register — common in bullet-comments (
弹幕), live-streams, and messaging with friends. Writing it in a formal document would be extremely odd.
