Perhaps 'lie' is too strong a word. To state that your child's first words were "crocodile" and "grandma Diana" could accurately be described as extremely statisically unlikely
Baby Talk Milestones
Baby talk at 3 months.At 3 months, your baby listens to your voice, watches your face as you talk, and turns toward other voices, sounds, and music that can be heard around the home. Many infants prefer a woman's voice over a man's. Many also prefer voices and music they heard while they were still in the womb. By the end of three months, babies begin "cooing" -- a happy, gentle, repetitive, sing-song vocalisation.
Baby talk at 6 months.At 6 months, your baby begins babbling with different sounds. For example, your baby may say "ba-ba" or "da-da." By the end of the sixth or seventh month, babies respond to their own names, recognise their native language, and use their tone of voice to tell you they're happy or upset. Some eager parents interpret a string of "da-da" babbles as their baby's first words -- "daddy!" But babbling at this age is usually still made up of random syllables without real meaning or comprehension.
Baby talk at 9 months.After 9 months, babies can understand a few basic words like "no" and "bye-bye." They also may begin to use a wider range of consonant sounds and tones of voice.
Baby talk at 12-18 months.Most babies say a few simple words like "mama" and "dadda" by the end of 12 months and now know what they're saying. They respond to or at least understand, if not obey -- your short, one-step requests such as, "Please put that down."
Baby talk at 18 months.Babies at this age say several simple words and can point to people, objects, and body parts you name for them. They repeat words or sounds they hear you say, like the last word in a sentence. But they often leave off endings or beginnings of words. For example, they may say "daw" for "dog" or "noo-noo's" for "noodles."
Baby talk at 2 years.By age 2, babies string together a few words in short phrases of two to four words, such as "Mommy bye-bye" or "me milk." They're learning that words mean more than objects like "cup" -- they also mean abstract ideas like "mine."
Sources:
Bergelson E and Swingley D. 2012. At 6-9 months, human infants know the meanings of many common nouns. Proc Natl Acad Sci U S A. 109(9):3253-8
Oller DK, Eilers RE, and Basinger D. 2001. Intuitive identification of infant vocal sounds by parents. Developmental Science. 4:49–60.
Syrnyk C and Meints K. 2017. Bye-bye mummy - Word comprehension in 9-month-old infants. Br J Dev Psychol. 35(2):202-217.
Tincoff R and Jusczyk PW. 2012. Six-Month-Olds Comprehend Words That Refer to Parts of the Body. Infancy. 17(4):432–444.
Tincoff R and Jusczyk PW. 1999. Some Beginnings of Word Comprehension in 6-Month-Olds. Psychological Science. 10(2):172–175.
Schneider RM, YurovskyD,andFrankMC.2015. Large-scale investigations of variability in children's first words.In D.C.Noelle, DC,R.Dale,A. S.Warlaumont,T.Matlock,C. D.Jennigs,and P. P.Maglio(eds):Proceedings of the 37th Annual Conference of the Cognitive Science Society, 2210–2115.