Totally depends on thr grounds of quashing. As such if the same are a mutual settlement, then yes it can be quashed. An appeal is basically a continuation of the trial court case and hence can very much be quashed as a consequential proceeding to the FIR in context.
I appreciate that you fought well and got acquittal from trial court. This appeal has been filed and prolongating by opponent intentionally to harass so that you can come for mutual and pay money to these wrong doers.
I hope you don’t believe on such things and hence you fought well in the trial court and got acquital. Please apply for Speedy proceedings writ petition of against this appeal in the High Court under with Article 227 read with Article 21 of Indian Constitution.