Do "Foreign" GOLD COINS have 3 values? Do they have EXCHANGE RATES?

Do foreign gold coins (say, Canadian Maple Leafs and other countries gold coins) have 3 values to them? 1) collectors appreciation value and 2) Daily spot/market price of the gold itself and 3) the foreign exchange value. And also, do real gold coins (foreign in this case) fluctuate according to exchange rates (FOREX RATES) . It would seem to me they should have some exchange rate since they could be used as currency if you wanted to. I am not sure. Thanks