Freezer floor
We've used a metal scrapper (a large one) to scrape the floor before. Not a fun/easy process, but one that could work.
Manual scraping if you can't thaw it out
Depends on what the base floor is, however have used spot burning - basic flame thrower. Can be fun, just try not to burn the building down.
Wow... I'm imagining my H&S colleagues if I suggested a flame thrower...
Seriously though, isn't the easiest thing to defrost it? Without damaging the floor, causing a fire or injuring someone? Get in a freezer trailer or dawson freezer unit if needed to store stock.