Can I substitute ground fenugreek for the fenugreek leaves?

While the ground/seeds of fenugreek and leaves are from the same plant (like coriander seeds and fresh cilantro), they have different tastes and textures in cooking.
You could try a substitution using ground, starting with about 1/3 the volume specified for fresh fenugreek.
Or, fresh parsley or cilantro (same volume) instead of the fenugreek.
The dish you make with either dried or fresh replacements will probably taste good but yes different from as written.