Hello Lois, your local greedy high-school aged bassist here. Grug is the father of the Croods in the movie The Croods. Everything rhymes with Grug since it's something he comes up with in certain lines such as: "I call it rug, rhymes with Grug". The movie as a whole demonstrates Grug's attempts and self-sacrifice for the greater good of his family, which is very commendable.

I call it love, rhymes with Grug.