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Mutoids was originally discovered in, of all places, an issue of Advertising Age:

TIGER ACTIVATING MUTOIDS IN '98 FOR ELECTRONIC GAMES

Ad Spending Will Jump 20% to $60 Million
By Jeff Jensen, Advertising Age Feb 98

Tiger Electronics, boosting ad spending 20% to more than $60 million in 1998, plans to feed its electronic games business with Mutoids, the company's first character-based property developed in-house.

The fledgling Mutoids brand will be launched on three Tiger game platforms, including game.com, a newer Internet-accessible cartridge-based gaming and communications system. The other two - 99X, a line of hand-held games; and Giga Fighter, an extension of the Giga brand of virtual pets that allows Giga Pet owners to link and fight each other - are new for '98.

Mutoid customers also can exchange pertinent data off the Internet via new accessories sold separately.

Apparently intended as an entry into the pokemon genre, Mutoids was officially announced as a non-release by Gary Webel of Tiger Electronics on January 18th 1999 in an email note intended for release in
TigerChat VI.