These are characters who are nameless or don't have their names revealed yet.
“The Pet Chameleon are the Gunderson's pet who only appeared in the episode, Get Toothy!Pet Chameleon
“Zorka's Pet Moose only appears in Get Elected!, Get Weather!, Get Cratered! and Get Racing!Zorka's Pet Moose
“Cave Mitch is Mitch's and Rodrigo's ancestor and Cave Rodrigo's dad who only appeared in Get...Cave Mitch
“Cave Blake is the ancestor of Blake Myers who only appeared in the episode, Get Prehistoric!Cave Blake
“Cave Fast Eddy is Fast Eddy's ancestor who only appeared in the episode, Get Prehistoric!Cave Fast Eddy
“Cave Rodrigo (or Cave My Dad referred by Mitch) is Mitch's and Rodrigo's ancestor as well as...Cave Rodrigo