Blackhawk's Batman Villains

Blackhawk had changed from a straight war comic to almost a team fighting super villains....but, they had a few interesting villains by name.

Blackhawk fought (a) Mr. Freeze and Cat-Man before Batman did!

Mr. Freeze

In Blackhawk #117 (October, 1957) with art by Dick Dillin and Chuck Cuidera, the Blackhawks were helping to test inventions by three scientists, when the items were stolen by a masked man, whom the Blackhawks called Mr. Freeze (due to his using an ice-ray, one of the items, on them). 

The team eventually deduced it was one of the scientists, Professor Thurman, who was the real criminal, using his robot to commit the crimes.

Cat-Man

While in Blackhawk #141 (October, 1959) also with Dillin/Cuidera art, the team encounters a villain who is willing to take incredible chances with his life, as he feels he was gifted with the lives of a cat by a witch doctor in Africa.  

Blackhawk and his crew convince him he has used up his extra lives, and not wanting to lose his last one, Cat-Man surrenders.

"The Real Ones"

But, Batman's Mr. Freeze debuted in Batman #121 (February, 1959, as Mr. Zero) and his Cat-Man in Detective Comics #311 (June, 1963), going on to long careers facing Batman and more.  

Though they aren't the same characters, Blackhawk had them as villains before Batman!