Are there any general techniques for evading frequency based crypt analysis without using any encryption techniques?
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Have a look at "Chaffing and winnowing: Confidentiality without encryption", RL Rivest, CryptoBytes (RSA laboratories), 1998. You can find the paper on scholar.google.com
Frequency-based cryptanalysis aims at breaking an encryption technique; hence evading frequency-based cryptanalysis implies an encryption technique.
Because frequency-based cryptanalysis is a poor attack, even some ridiculously weak encryption technique may evade frequency-based cryptanalysis. For example, putting the symbols alphabetically on two rings, using that as a correspondence table, and sliding the rings by one step after each use evades frequency-based cryptanalysis, at least in basic form.