Do European airlines do dynamic currency conversion

I "think" their website will let you choose dollars or forints gir payment. If it's quoted in forints your bank will change it. If you choose dollars, well, that's what you pay. Do the math if it's a lot. Check the rate your bank will charge you at the Visa currency exchange website and compare to Wizz's dollar offer. But most Wizz flights are around $100 so we are talking at most a $10 difference I would suspect. I bought Wizz tickets about 2 weeks ago but paid off my Hungarian ATM card so I am guessing a bit here.

It is possible, but in my experience they usually display the price in the currency chosen, more for convenience than some ulterior motive. If they display a price in a currency, and that is what you pay, that is not really DCC. DCC would be if Wizzair displayed the price in Forints, then offered to convert it to USD for you. Now whether there is an advantage buying in one currency or another, that comes down to math. I know with Easyjet and Ryanair it was at one time a better deal to purchase tickets in euros as opposed to GBP when your credit card converts it back to USD. It may have been not so much the rack price, but upgrades and fees were advertised as either 10 euro or 10 GBP, (for example) and 10 euro is significantly less than 10 GBP.

Bottom line, no DCC likely, but compare the cost in USD for each of the offered currencies to see if there is benefit.

I've checked this on various airlines from time-to-time - they display in NZ$ for me - which is hardly ever the currency charged on European airlines. I found little to no difference if I manually changed to the airline's currency - so I just leave it alone.