How can I make an artificial Apple tree minature tree for Fairy Garden

JoAnn's Craft store sells them for about $5 .

This site sells various mini fake trees for just your purpose at a reasonable price. I guess you could make one but for the effort and cost, might be cheaper to buy pre made:

https://www.aliexpress.com/popular/artificial-apple-tree.html

you can use a sturdy small branch that looks like a mini tree attach some small silk leaves to look like the trees foliage them get some red polymer clay like femo and make pea sized balls make a small depression in the top and insert a small thin wire to attach to the tree bake in oven at suggested temp should look great

Maybe like you would make a mini topiary. I would recommend a sturdy short stick for a truck, a small Styrofoam ball covered in moss and red or yellow beads glued on for the apples