This Car Décor would be a great gift.  Make it for yourself or give it to your family and friends.
You can not connect the toys together, but sew a metal keychain fastener to each and use it as a keychain or hang it on a backpack.

Pattern contains a description of crocheting: acorn and leaf.

PLEASE NOTE THAT THIS IS A CROCHET PATTERN, NOT THE FINISHED PRODUCT.

This listing is an original pattern (written in English using American terminology) to crochet.

— The size of the acorn is about 5.5 cm (2.16 inches); 
— The size of the leaves is about 9 cm (3.54 inches); 

This crochet pattern is easy to follow with step-by-step instructions, photos illustrating the process).
It does not contain crochet lessons. You should have basic crochet skills to be able to crochet with the help of this crochet pattern.

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Recommended materials and tools
Sport weight/4ply yarn YarnArt JEANS or Alize Cotton Gold. You can use any leftover yarn of green and brown colors.
Sewing needle 
Hook size 2.25 mm by Clover
Fiberfill

Abbreviations: 
MR – magic ring 
ch – chain 
sc – single crochet 
sl st – slip stitch
hdc – half double crochet stitch
dc – double crochet stitch
dcinc – double crochet increase (2dc in one stitch)
tr – treble crochet