A little of both. In our house, the green things we are doing will have a long-term frugal impact but short term, are generally not frugal.
I am working towards green, switched from regular cleaners (chemical) to 90%homemade. I completely bypassed the 7th Generation type stuff.
When replacing old carpet, we installed locally grown (from a managed forest) and milled hardwood floors. The wood probably didn't travel 50 miles from forest to our house. Green, I think so. Frugal, long term yes short term no.
I look for second-hand for ds's clothing (frugal) but also have no problem buying multiples of more expensive stuff because I know it will last longer (IMOE) than the cheaper big box stuff. (not frugal)
In trying to reduce in our homelife, I am not frugal. I will spend more on one great pair of shoes that I can wear all the time over several less expensive pairs that are of poor utility.
Same with house stuff. We are on our 5th or 6th set of pots and pans in 13 years. I had bought inexpensive non-stick stuff in the past. The next set will be American made, stainless, heavy-duty stuff that will likely be the last set I ever buy.