TALK SHOWS

7 p.m. on Nature

It’s said that some people have to kiss a lot of frogs. If so, there certainly is a wide variety of the creatures to choose from, as the episode “Fabulous Frogs” underscores. Sir David Attenborough surveys the differences, from physiology to behavioral traits. One of the variations is the wood frog, which can survive freezing winters — and which is under consideration to become New York’s official state amphibian.

7 p.m. on MasterChef

Things get downright crabby in the new episode “Gordon Ramsay’s Masterclass,” as the amateur chefs deal with ... well, guess which kind of seafood? Ramsay shows them how to prepare it, as a warmup to using it in his Crab Benedict recipe. He’s bound to be a harsh judge of the results, which Joe Bastianich and Aaron Sanchez also gauge. Not everyone who starts the hour will be there at the end.

8 p.m. on Gordon Ramsay’s 24 Hours to Hell and Back

If anyone currently on broadcast television is a master of variations on a theme, it has to be “Hell’s Kitchen” and “MasterChef” veteran Ramsay. He has something new cooking with the premiere of this series, in which he travels across America to troubled restaurants that may have to shut down unless he can upgrade them successfully, literally within 24 hours. He utilizes a mobile kitchen that makes its first stop at the Congers, N.Y., restaurant that gives this episode the title “Bella Gianna’s.”

9 p.m. on CNBC The Deed

Self-made real-estate mogul Sidney Torres returns for a second season of rescuing struggling property owners in exchange for a piece of the property and a percentage of profits from any sale. These funds are used by the developers to restore dilapidated homes to their former glory, with Torres’ expertise gleaned from his own years of experience, plus his natural design savvy. This season’s partners include two recovering addicts seeking to make a fresh start and an ambitious law student.

9 p.m. on Travel Channel Caribbean Pirate Treasure

Underwater explorer Philippe Cousteau, grandson of celebrated oceanographer Jacques Cousteau, and Philippe’s journalist wife, Ashlan, return for another season of pirate-themed adventures, which premieres tonight with two new back-to-back episodes. In the season opener, the couple brave angry seas and contemporary pirates to delve into the story of ruthless buccaneer Bartholomew Sharp.