Not sure of the etiquette for responding to this, but I worked for PPC back in the early 80's doing pixel art (I was 14). I worked on Pot 'o Gold (development name), Pirate's Treasure and their fist game Chaos. I remember they commissioned some ceramic dragons for the development team. Let me know if you want to know more and I'll see if I can dredge through the tar pit of memory.
A little more info about the Moppet Games and Tuni/Enter-Tech etc.
Leprechaun and Pirate's Treasure were actually designed by a separate group called Pacific Polytechnical Corp in Santa Cruz. The main programmer of the games was Todd A Blume (who also designed Beezer). Blume programmed in a language called FILTH (a variant of FORTH) developed by Shel Kaphan. Pacific Polytechnical Corp was founded by a group of friends from UC Santa Cruz, including Shel Kaphan (who later became Amazon's first employee and wrote its initial software). Others at PPC included Ken Clements (President), Frank Frazier, and David Dougherty. PPC also designed Kaos for Game Plan and later established a division called FrobCo that developed the Frob 26 and Frob 52 (Atari 2600/5200 development systems for the Apple II).
From what was reported in the trade press, E.T. Marketing of Temp manufactured games for Tuni Electo Services. E.T. had been founded by Tuni's marketing director Patrick Reed. The Moppet games were marketed by Enter-Tech Ltd of Tempe and Intrepid Marketing of Los Altos (I think E.T. marketed them as well).
Here is a brief section from my book on E.T. and Tuni:
"Beezer, Leprechaun, and Pirates Treasure were introduced at the 1982 AMOA show in November, along with Tugboat and Desert Race. By then, one of the companies involved in the venture, Tuni Electro Services, was already in trouble. In September 1982, E.T. Marketing announced that it had acquired all of Tuni's assets pending approval by the company’s creditors and board of directors. The creditors included the principals of Enter-Tech and in December, Enter-Tech entered into negotiations with Tuni to block the E.T. takeover (RePlay 3/83; Play Meter 3/15/84). But Tuni was not out of the woods yet. A month later Tuni was pushed into bankruptcy by Dracott Ltd of Switzerland and its assets were frozen. Dracott, the parent company of Enter-Tech, had invested $2 million in Tuni and did not want Enter-tech to have to assume its liabilities. In March, Enter-Tech acquired the company's assets and reorganized it¸ successfully bringing it out of Chapter 11 in December 1983 (RePlay 1/84; Play Meter 3/15/84). Under the Enter-Tech name, the company continued to produce Moppet games. Late in 1983, it struck a licensing deal with King Features Syndicate, which was best known for the many comic strips it distributed to newspapers worldwide. The deal resulted in two games base on King Features properties. The first was The Berenstain Bears in Big Paw's Cave. The game was based on the line of children’s book created by Stan and Jan Berenstain that had become a hot property after a series of NBC specials earlier in the year, including one called "Big Paw’s Cave." The game involved guiding a baby bear down a winding path through Big Paw’s Cave trying to retrieve stolen honey without waking the sleeping Big Paw. In early 1984, EnterTech licensed King Features’ most famous property – Popeye – for use in a seventh Moppet video. By then, however, the concept had all but died. Big Paw’s cave seems to have been produced only in small numbers while Popeye does not appear to have been produced at all
 This is somewhat uncertain. The claim is based largely on collectors’ claims that only a single copy (at the Harborview Hospital in Seattle) is known to have existed. Trade magazines, however, announced the game’s release and included it in their catalogs and it was shown at the 1983 AMOA.