The moss I use is pre-packaged natural moss from the pet store.
I suppose it is possible such moss may include some bugs in it, but I doubt any that are harmful to the reptiles. I've never heard of the pre-packaged moss containing stuff harmful to reptiles.
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11.14 L. getula californiae (Cal. King)
2.3 L. getula nigrita (MBK)
1.0 L. getula floridana (Brooksi)
1.1 Pantherophis guttatus guttatus (Corn)
0.1 Pituophis catenifer catenifer (Pacific gopher)
0.1 Heterodon nasicus nasicus (W Hognose)
4.2.14 Elgaria multicarinata multicarinata - (Cal. Alligator Lizard)