I ran this for my 3e group way back in the 3e days. Back then I really had no idea what Blackmoor was or who Dave Arneson was so I can't recall any similarities.

Finally got my hands on this module. Turns out there is more Blackmoor related material here than I first assumed. An entire dungeon level is dedicated to the Frog God. In addition there is the new monster race, the Tsathar ("su-Thar"). Although similar to Froglin, they are sexless and their origins suggest they are related to Slaad. If anything they could be used as a Deep Froglin type race.

There are also a couple of references to Hel in the module, including with a magic item. Hel is of course known as Hella in the D20 Blackmoor line.

-Havard