Two examples for me:
Lacey Chabert voiced Eliza Thornberry from The Wild Thornberries and played Gretchen Wieners from Mean Girls.
Jason Gray-Stanford voiced Raditz in Dragon Ball Z and voiced Donatello in the live-action Ninja Turtles: The Next Mutation. He also played Randall Disher in Monk and voiced the titular character in Sherlock Holmes in the 22nd Century.
Lacey Chabert voiced Eliza Thornberry from The Wild Thornberries and played Gretchen Wieners from Mean Girls.
Jason Gray-Stanford voiced Raditz in Dragon Ball Z and voiced Donatello in the live-action Ninja Turtles: The Next Mutation. He also played Randall Disher in Monk and voiced the titular character in Sherlock Holmes in the 22nd Century.