The kids were crammed in a tiny room to do their homework.

crammed 是动词 cram 的过去分词形式。cram 的意思是"塞满、挤满"，常用来形容人或物被强行塞进狭小空间的情况。这里用过去分词形式表示被动状态，指"被塞进、被挤在"小房间里。