Yes, it is okay to give it to them as a treat. As long as you are giving them a well-rounded diet and they are not getting obese, it is okay to give them treats--this is especially useful in your handling sessions to get them acclimated to you.
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Lisa Rakestraw
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My skinks:
1.1.1 Corucia zebrata (Berman and Joni, baby Charlemagne)
1.2.2 Eumeces schneideri (Kaa, Cochisa and their babies; Mabel)
0.0.4 Egernia striolata