豚児 is read as とんじ (tonji) and means piglet.
とんじ
tonji
ぶた
pig (Sus scrofa domesticus)
とんにく
pork
とんかつ
tonkatsu
ぶたごや
pigsty
こじ
orphan
いじ
abandoned child
みじゅくじ
premature baby
たいじ
fetus
したいふじゆうじ
physically disabled child
じしいじ
child who has survived the suicide of a parent
こうつういじ
child orphaned from a traffic accident
ちてきしょうがいじ
intellectually disabled child