You may use any yarn to make this toy, just make sure to use correct hook size with your yarn.

You will need following or similar materials to crochet the bunny as on the picture:

1) Alize SOFTY 100% micro-polyester, 115 m, 50 g – white, yellow and light blue color for bunny. Orange and green color for carrot.
2) Some pink yarn for the nose and smile
3) Crochet hook 4,0 mm
4) Fiberfill for stuffing
5) Safety eyes - 16 mm