Cleaning Up Matted Down Foliage In Tight Space
A "stirrup hoe" or one of the ones with a very narrow blade tapering to a point could work.

I've got a tool that I generally call my "grub hoe" because it looks somewhat like the ones used by forest fire crews. It has a narrow hoe blade on one side, almost like an adze (except I wouldn't use it for shaping logs), and a three-tine rake on the other side.

It's kinda handy. I can look for a brand name on it, if you want to know more.