Interesting approach to feeding! My first three thoguths are:
1-if they were in your pool they will be saturated with chlorine
2-the chances of getting your cham to eat dead insects is unlikely
3- as for those "unknown"...if you are unsure what they are then you cannot know if they carry natural toxins (e.g. monarch butterflies, lightning bugs and many others.
You would also have to watch for any that had started to decompose before you froze them and/or as they thaw. Decomposition will bring along fungal spores and bacteria.
Btw, the nutritional value will be greatly reduced by freezing & insects have a tendency to turn to mush when thawed. I am sure others may have different opinions, but I would stick to live, chemical-free, known feeders.
lele
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0.1 Veiled Chameleon - Luna
1.0 Beardie - Darwin
0.2 felines - Kyndra and Lita
0.1 African Clawed Frog - Skipper
0.3 Mad. Hissers (2 died ;(
0.1 Chilean Rose Hair Tarantula - Rosa Leigh
0.1 Goliath Bird-Eater Tarantula - Natasha
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