Now I'm thinking Monster Hunter style glowbugs, flashfly, Vigorwasps, Dung Beetle, para/sleeptoad, Burst arowana

Some Examples are:

1. Plumpstools - Cushiony plants that stop or half fall damage
2. Bouncepods - Large mushrooms that are bulging and so can be used like trampolines, bursting one makes for a really large jump but stops it from being used again and kills the plant.
3. Razorvines - (From the DND book) razor like vines that do damage if moving through them or grabbing onto them!
4. Displaceshrooms - when withing 15 feet of one attacks against you have disadvantage as they displace natural light around them and make things hard to see
5. Traumaroots - If consumed they have heavy calming properties, that slow everything around you down. You attack with advantage, and attacks against you have disadvantage. However you're deafened for a minute, and after a minute passes you're stunned.
6. Magebulbs - You can drink from these to regain spellslots/ki back, con save or be poisoned as the mana doesn't connect with you properly
7. Smokers - Worm looking plants that when hit produce fog within 20feet and continue to do so for a minute
8. Bombastium - An ore that when ignited explodes. A miners worst nightmare.
9. Meltrees - Waxy trees that much like a candle, has an alternative melting point which melts in moderately warm temperatures, if you touch it whilst its melting you can be grappled. It does so to get insects trapped that it consumes.
10. Waterorb - A strange cabbage looking plant that has leaves that surround a globule of water, a strange residue the plant produces basically keeps the water in a small thin veil that allows it to be carried, or thrown. It too captures smaller insects and animals in this way as the insects will pierce the veil to drink from the water and then get stuck inside the veil
11. Frostorb - From the same species as the waterorb, but that has hit freezing point, the orb has completely frozen over.
12. Bladegrass - thin silvery grass that is hardened and secretes thin globules of red liquid that resemble blood. Can be used as a improvised weapon doing 1d6 slashing damage. Druids and Rangers can use it as a 1d8 weapon and with proficiency.
13. Chaosshroom - Wild magic bitches, you know exactly what it does
14. Cactipear - touching it does piercing damage, throwing it does piercing damage. its a cactus. Shaped like a pear.
15. Balloonflower - A flower that has produced its own gas to make it float, it stays connected to the ground via a root, but if that root is cut the flower will fly upwards like a balloon.
16. Flying Giant Spiders - They use their webs like parachutes. Befriending one can make for great rides!
17. Velcrows - sticky birds that carry trinkets that they attatch to their sticky feathers.
18. Growgoats - Goats that can reduce or enlarge themselves. Commonly found on the side of mountains, scaring them can make them either enlarge themselves to defend, or reduce to run away
19. Grumbler - Small armadillo like creatures, that curl up into a ball with people around. Their shells are extremely durable and so they can be used as improvised weapons. (Not that you should, thats animal cruelty)
20. Thunderbugs - Bugs that when disturbed will shock people that disturbed them
21. Manaeaters - Bugs that devour magic, if you cast near them, they will look to consume your magic, whilst swarming they can cast counterspell consuming the spell, but when biting/attacking they will consume the lowest spell slot each round (stirge based)