Nope. No-one makes compression fittings with a G3/8" thread that I'm aware of.
You'd need a G3/8" to G1/4" Reducer, then use whatever G1/4" compression fitting you want.

Finally, no-one makes compression fittings that can accept 3/4" OD that I'm aware of either. For 1/2" ID 3/4" OD tubing, you're limited to regular barbs only.

If you want to use compression fittings, you need to limit your tubing size to 1/2" OD maximum.