Adorable degus! 
I often fed my degus' salads by hand as "treats" so don't forget about vegetables and herbs
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Other than fresh foods, some ideas are dried flower petals, rose hips, dried herbs, dehydrated vegetables, sugar-free cereal (small quantities), and nuts (peanuts were a big hit with mine and walnuts were good chew toys when given with the shell still on).
I often fed my degus' salads by hand as "treats" so don't forget about vegetables and herbs
Other than fresh foods, some ideas are dried flower petals, rose hips, dried herbs, dehydrated vegetables, sugar-free cereal (small quantities), and nuts (peanuts were a big hit with mine and walnuts were good chew toys when given with the shell still on).