Muppetlike

There is also a lesson in how to construct your own Bill & Ted robots out of the materials available from your local builder’s emporium—though you won't be able to do this unless you have at your command a couple of ugly, Muppetlike physics geniuses from Mars.

Source: wiktionary

While Breen related with the Muppetlike creatures, getting them to talk and play with the children, leaning over them to give them hugs and big silly kisses, Tess smiled and was, for all appearances, totally trusting.

Source: wiktionary

The monster also had swim fins and a seaweed skirt. Anything but convincing or even really serviceable, its Muppetlike appearance was appropriate to this film.

Source: wiktionary