For winter, bottom-heavy grass, the best approach is usually a lure that can come through cover cleanly and still trigger reaction bites. Delong Lures Bladed Top Water Frogs are the strongest true topwater option here for matted or sparse grass edges when fish are willing to rise.
If you want a more slow, bottom-oriented presentation in grass, Delong Lures 10″ Weedless Twister Tail KILR Worms and Delong Lures The Squirm (Weedless) are better fits for dragging through heavy cover and probing the bottom.
Great Outdoors Shops Intruder Lizard is a good cold-water grass bait because lizards are a classic winter bass profile around vegetation and bottom cover.
Switch away from topwater if bass are not showing on the surface, the water is very cold, or the grass is too submerged for a clean topwater path. In that case, the weedless worm, Squirm, or lizard will usually outproduce a frog. If fish are suspended or inactive, a slower bottom presentation is better than a surface bait.