No they are not. Nuts of any kind are too fatty for chinchillas and can lead to ill health effects. Safe treats include unfrosted shredded wheat, old fashioned oats, plain cherrios, rose hips. You can also find various chin cookies that people make here that chins love. The key to treats is give them in moderation. Only 1-2 times per week. Chins have very sensitive digestive systems and therefore should not be given many treats.