泥塑木雕 is an idiom

as wooden as a dummy; like an idol moulded in clay or carved in wood

指泥做的和木头雕的偶像。比喻人的表情和举动呆板。

Origin 明·冯梦龙《警世通言》卷九：“两班文武，如泥塑木雕，无人敢应。”