Mangrove marsh for gondwa
Considering the latest tweaks to Gondwa, adding new assets and character to each biome, I think it'd be a good idea to tweak the marsh biome, changing the current beech trees for red mangroves. This would further differentiate the marsh from the neighbouring beech forest, making it a unique point of interest and embrace the marsh as a proper biome, rather than an extenction of the classic beech forest we are all used to by now.
Mangrove trees, with their large root systems and flat treetops, would create a perfect environment for both small aquatics (including juvenile semiaquatics) and flyers, giving Sharptooth Marsh the extra life it needs.
Another possible option, assuming mangrove assets are hard to find, would be willow trees, which thanks to their long and low branches would be able to hide small playables and young semis.