I do not take credit for this but here are the 8 different evolved species:
• Candary: Have your Sparrowmint eat a buttercup flower and it will change into a Candary.
• Juicy Goose: Have your Quackberry eat a Gooseberry and it will evolve into a Juicy Goose.
• Lackatoad: Direct your Lickatoad to eat a Nightshade fruit and then quickly equip your shovel and tap it on the head. It will become a Lackatoad. You want to do this before it becomes poisoned.
• Redhott: Select a Taffly and direct it to a torch. Once it flies through and catches fire equip your Water Can and wait for it to land. As soon as the Taffly lands pour water on it to put the fire out. The Taffly will then become a Redhott.
• Salamango: Have your Newtgat eat a Chili and it will change into a Salamango.
• Zumbug: Direct your Horstachio to eat both a Blackberry and a Daisy flower and it will become a Zumbug.
• Twingersnap: Romance two Syrupants. Watch the egg that follows and right before it hatches, you will see it make three large bounces. On the third bounce, hit it with your shovel. A twingersnap will hatch. Don't confuse the hop-hop-hop with the normal bouncing of the egg.
• Fourheads: Same as above but you have to romance two Twingersnaps.