Hiding the bones/images as mentioned above, will also hide them from the dopesheet. If you open the preview view, they will still be visible in case you need to check the animation out.
If you need to have the images visible, either you delete the keyframes to have them not animating, or, if it's ok for them to be animated but the problem is how crowded your dopesheet is, you can instead select the bones/images that you want to see in the dopesheet, then lock the selection:
Dopesheet - Spine User Guide: Contents
There aren't other ways to have animated parts not animate and still be visible as far as I'm aware.